Key Words
Publications
2017 [ to top ]

Chimani, M., Felsner, S., Kobourov, S., Ueckerdt, T., Valtr, P., Wolff, A.: On the Maximum Crossing Number. In: Brankovic, L., Ryan, J., and Smith, B. (eds.) Proc. 28th Int. Workshop Combin. Algorithms (IWOCA'17). SpringerVerlag (2017).[ BibTeX ]

Das, A., Fleszar, K., Kobourov, S.G., Spoerhase, J., Veeramoni, S., Wolff, A.: Approximating the Generalized Minimum Manhattan Network Problem. Algorithmica. (2017).

Chaplick, S., Fleszar, K., Lipp, F., Ravsky, A., Verbitsky, O., Wolff, A.: The Complexity of Drawing Graphs on Few Lines and Few Planes. In: Ellen, F., Kolokolova, A., and Sack, J.R. (eds.) Proc. Algorithms Data Struct. Symp. (WADS'17). SpringerVerlag (2017).[ BibTeX ]

Bekos, M.A., van Dijk, T.C., Fink, M., Kindermann, P., Kobourov, S., Pupyrev, S., Spoerhase, J., Wolff, A.: Improved Approximation Algorithms for Box Contact Representations. Algorithmica. 77, 902920 (2017).
2016 [ to top ]

Evans, W.S., Fleszar, K., Kindermann, P., Saeedi, N., Shin, C.S., Wolff, A.: Minimum Rectilinear Polygons for Given Angle Sequences. In: Akiyama, J., Ito, H., and Sakai, T. (eds.) Proc. Japan. Conf. Discrete Comput. Geom. Graphs (JCDCGG'16). p. 105119. SpringerVerlag (2016).

van Dijk, T.C., Fink, M., Fischer, N., Lipp, F., Markfelder, P., Ravsky, A., Suri, S., Wolff, A.: Block Crossings in Storyline Visualizations. In: Hu, Y. and Nöllenburg, M. (eds.) Proc. 24th Int. Symp. Graph Drawing & Network Vis. (GD'16). p. 382398. SpringerVerlag (2016).

Chaplick, S., Lipp, F., Park, J.won, Wolff, A.: Obstructing Visibilities with One Obstacle. In: Hu, Y. and Nöllenburg, M. (eds.) Proc. 24th Int. Symp. Graph Drawing & Network Vis. (GD'16). p. 295308. SpringerVerlag (2016).

Kindermann, P., Niedermann, B., Rutter, I., Schaefer, M., Schulz, A., Wolff, A.: MultiSided Boundary Labeling. Algorithmica. 76, 225258 (2016).

Lipp, F., Wolff, A., Zink, J.: Faster ForceDirected Graph Drawing with the WellSeparated Pair Decomposition. Algorithms. 9, article 53, 17 pages (2016).

Haunert, J.H., Wolff, A.: Räumliche Analyse durch kombinatorische Optimierung. In: Freeden, W. and Rummel, R. (eds.) Handbuch der Geodäsie (6 Bände). p. 139. Springer Berlin Heidelberg (2016).

Chaplick, S., Fleszar, K., Lipp, F., Ravsky, A., Verbitsky, O., Wolff, A.: The Complexity of Drawing Graphs on Few Lines and Few Planes, http://arxiv.org/abs/1607.06444, (2016).

Chaplick, S., Fleszar, K., Lipp, F., Ravsky, A., Verbitsky, O., Wolff, A.: Drawing Graphs on Few Lines and Few Planes. In: Hu, Y. and Nöllenburg, M. (eds.) Proc. 24th Int. Symp. Graph Drawing & Network Vis. (GD'16). p. 166180. SpringerVerlag (2016).

Budig, B., Dijk, T.C.V., Wolff, A.: Matching Labels and Markers in Historical Maps: An Algorithm with Interactive Postprocessing. ACM Trans. Spatial Algorithms Syst. 2, 13:113:24 (2016).

Löffler, A., van Dijk, T.C., Wolff, A.: Snapping Graph Drawings to the Grid Optimally. In: Hu, Y. and Nöllenburg, M. (eds.) Proc. 24th Int. Symp. Graph Drawing & Network Vis. (GD'16). p. 144151. SpringerVerlag (2016).

Bekos, M.A., van Dijk, T.C., Kindermann, P., Wolff, A.: Simultaneous Drawing of Planar Graphs with RightAngle Crossings and Few Bends. Journal of Graph Algorithms & Applications. 20, 133158 (2016).

Haunert, J.H., Wolff, A.: Beyond Maximum Independent Set: An Extended Model for PointFeature Label Placement. Proc. ISPRS (Commission II, WG II/2). p. 109114 (2016).
2015 [ to top ]

Bereg, S., Fleszar, K., Kindermann, P., Pupyrev, S., Spoerhase, J., Wolff, A.: Colored NonCrossing Euclidean Steiner Forest. In: Elbassioni, K. and Makino, K. (eds.) Proc. 26th Annu. Int. Symp. Algorithms Comput. (ISAAC'15). p. 113. SpringerVerlag (2015).

Lipp, F., Wolff, A.L., Zink, J.: Faster ForceDirected Graph Drawing with the WellSeparated Pair Decomposition. In: Di Giacomo, E. and Lubiw, A. (eds.) Proc. 23rd Int. Symp. Graph Drawing & Network Vis. (GD'15). p. 5259. SpringerVerlag (2015).

Chaplick, S., Kindermann, P., Lipp, F., Wolff, A.: Solving Optimization Problems on Orthogonal Ray Graphs. Proc. Japan. Conf. Discrete Comput. Geom. Graphs (JCDCGG'15). p. 2 pp. (2015).

Alam, M.J., Bläsius, T., Rutter, I., Ueckerdt, T., Wolff, A.: Pixel and Voxel Representations of Graphs. In: Di Giacomo, E. and Lubiw, A. (eds.) Proc. 23rd Int. Symp. Graph Drawing & Network Vis. (GD'15). p. 472486. SpringerVerlag (2015).

Fink, M., Pupyrev, S., Wolff, A.: Ordering Metro Lines by Block Crossings. Journal of Graph Algorithms & Applications. 19, 111153 (2015).

Schwartges, N., Morgan, B., Haunert, J.H., Wolff, A.: Labeling Streets Along a Route in Interactive 3D Maps Using Billboards. In: Bacao, F., Santos, M.Y., and Painho, M. (eds.) Proc. 18th AGILE Conf. Geogr. Inform. Sci. (AGILE'15). p. 269287. SpringerVerlag (2015).

Bekos, M.A., van Dijk, T.C., Kindermann, P., Wolff, A.: Simultaneous Drawing of Planar Graphs with RightAngle Crossings and Few Bends. In: Rahman, M.S. and Tomita, E. (eds.) Proc. 9th Int. Workshop Algorithms Comput. (WALCOM'15). p. 222233. SpringerVerlag (2015).

Das, A., Gansner, E.R., Kaufmann, M., Kobourov, S., Spoerhase, J., Wolff, A.: Approximating Minimum Manhattan Networks in Higher Dimensions. Algorithmica. 71, 3652 (2015).
2014 [ to top ]

Bekos, M.A., van Dijk, T.C., Fink, M., Kindermann, P., Kobourov, S., Pupyrev, S., Spoerhase, J., Wolff, A.: Improved Approximation Algorithms for Box Contact Representations. In: Schulz, A. and Wagner, D. (eds.) Proc. 22nd Annu. Europ. Symp. Algorithms (ESA'14). p. 8799. SpringerVerlag, Wroc{\l}aw (2014).

Kindermann, P., Schulz, A., Spoerhase, J., Wolff, A.: On Monotone Drawings of Trees. In: Duncan, C. and Symvonis, A. (eds.) Proc. 22nd Int. Sympos. Graph Drawing (GD'14). p. 488500. SpringerVerlag (2014).

Barth, L., Fabrikant, S.I., Kobourov, S., Lubiw, A., Nöllenburg, M., Okamoto, Y., Pupyrev, S., Squarcella, C., Ueckerdt, T., Wolff, A.: Semantic Word Cloud Representations: Hardness and Approximation Algorithms. In: Pardo, A. and Viola, A. (eds.) Proc. 11th Latin American Sympos. Theor. Inform. (LATIN'14). p. 514525. SpringerVerlag (2014).

Schwartges, N., Haunert, J.H., Wolff, A., Zwiebler, D.: Point Labeling with Sliding Labels in Interactive Maps. In: Huerta, J., Schade, S., and Granell, C. (eds.) Proc. 17th AGILE Conf. Geogr. Inform. Sci. (AGILE'14). p. 295310. SpringerVerlag (2014).

Alam, M.J., Bekos, M.A., Kaufmann, M., Kindermann, P., Kobourov, S.G., Wolff, A.: Smooth Orthogonal Drawings of Planar Graphs. In: Pardo, A. and Viola, A. (eds.) Proc. 11th Latin American Sympos. Theor. Inform. (LATIN'14). p. 144155. SpringerVerlag (2014).

Schwartges, N., Wolff, A., Haunert, J.H.: Labeling Streets in Interactive Maps using Embedded Labels. In: Huang, Y., Schneider, M., Gertz, M., Krumm, J., and Sankaranarayanan, J. (eds.) Proceedings of the 22nd ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (ACMGIS'14). p. 517520 (2014).

Bekos, M.A., van Dijk, T.C., Kindermann, P., Wolff, A.: Simultaneous Drawing of Planar Graphs with RightAngle Crossings and Few Bends. In: Duncan, C. and Symvonis, A. (eds.) Proc. 22nd Int. Sympos. Graph Drawing (GD'14). p. 515516. SpringerVerlag (2014).

Kindermann, P., Lipp, F., Wolff, A.: Luatodonotes: Boundary Labeling for Annotations in Texts. In: Duncan, C. and Symvonis, A. (eds.) Proc. 22nd Int. Sympos. Graph Drawing (GD'14). p. 7688. SpringerVerlag (2014).

Wismath, S., Wolff, A.: Guest Editors' Foreword (Special Issue of Selected Papers from the 21st Int. Symp. Graph Drawing). Journal of Graph Algorithms & Applications. 18, 174175 (2014).

Aulbach, M., Fink, M., Schuhmann, J., Wolff, A.: Drawing Graphs within Restricted Area. In: Duncan, C. and Symvonis, A. (eds.) Proc. 22nd Int. Sympos. Graph Drawing (GD'14). p. 367379. SpringerVerlag (2014).

Barth, L., Fabrikant, S.I., Kobourov, S., Lubiw, A., Nöllenburg, M., Okamoto, Y., Pupyrev, S., Squarcella, C., Ueckerdt, T., Wolff, A.: Semantic Word Cloud Representations: Hardness and Approximation Algorithms, http://arxiv.org/abs/1311.4778, (2014).

Angelini, P., Eppstein, D., Frati, F., Kaufmann, M., Lazard, S., Mchedlidze, T., Teillaud, M., Wolff, A.: Universal Point Sets for Drawing Planar Graphs with Circular Arcs. Journal of Graph Algorithms & Applications. 18, 313324 (2014).

Fink, M., Lechner, M., Wolff, A.: Concentric Metro Maps. Proc. Schematic Mapping Workshop (SMW'14). , Wivenhoe Park (2014).

Peng, D., Wolff, A.: Watch Your Data Structures. Proc. 22th Annu. Geograph. Inform. Sci. Research Conf. UK (GISRUK'14). , Glasgow (2014).
2013 [ to top ]

Kindermann, P., Niedermann, B., Rutter, I., Schaefer, M., Schulz, A., Wolff, A.: TwoSided Boundary Labeling with Adjacent Sides. In: Fekete, S. (ed.) Proc. 29th Europ. Workshop Comput. Geom. (EuroCG'13). p. 233236. , Braunschweig (2013).

Angelini, P., Eppstein, D., Fabrizio Frati, M.K., Lazard, S., Tamara Mchedlidze, M.T., Wolff, A.: Universal Point Sets for Planar Graph Drawings with Circular Arcs. Proc. 25th Canadian Conf. Comput. Geom. (CCCG'13). p. 117122. , Waterloo, ON, Canada (2013).

Das, A., Fleszar, K., Kobourov, S.G., Spoerhase, J., Veeramoni, S., Wolff, A.: Approximating the Generalized Minimum Manhattan Network Problem. In: Cai, L., Cheng, S.W., and Lam, T.W. (eds.) Proc. 24th Annu. Int. Symp. Algorithms Comput. (ISAAC'13). p. 722732. SpringerVerlag (2013).

Das, A., Fleszar, K., Kobourov, S.G., Spoerhase, J., Veeramoni, S., Wolff, A.: Polylogarithmic Approximation for Generalized Minimum Manhattan Networks. In: Fekete, S. (ed.) Proc. 29th Europ. Workshop Comput. Geom. (EuroCG'13). p. 8184. , Braunschweig (2013).

Peng, D., Haunert, J.H., Wolff, A.: Morphing Polylines Based on Least Squares Adjustment. Proc. 16th ICA Generalisation Workshop (ICAGW'13). , Dresden (2013).

Kindermann, P., Niedermann, B., Rutter, I., Schaefer, M., Schulz, A., Wolff, A.: MultiSided Boundary Labeling, http://arxiv.org/abs/1305.0750, (2013).

Wolff, A.: Graph Drawing and Cartography. In: Tamassia, R. (ed.) Handbook of Graph Drawing and Visualization. p. 697736. CRC Press, Boca Raton, FL (2013).[ BibTeX ]

Fink, M., Haunert, J.H., Spoerhase, J., Wolff, A.: Selecting the Aspect Ratio of a Scatter Plot Based on Its Delaunay Triangulation. IEEE Transactions on Visualization and Computer Graphics. 19, 23262335 (2013).

Schwartges, N., Allerkamp, D., Haunert, J.H., Wolff, A.: Optimizing Active Ranges for Point Selection in Dynamic Maps. Proc. 16th ICA Generalisation Workshop (ICAGW'13). , Dresden (2013).

Bruckdorfer, T., Cornelsen, S., Gutwenger, C., Kaufmann, M., Montecchiani, F., Nöllenburg, M., Wolff, A.: Progress on Partial Edge Drawings. In: Didimo, W. and Patrignani, M. (eds.) Proc. 20th Int. Sympos. Graph Drawing (GD'12). p. 6778. SpringerVerlag (2013).

Fink, M., Haverkort, H., Nöllenburg, M., Roberts, M., Schuhmann, J., Wolff, A.: Drawing Metro Maps using Bézier Curves. In: Didimo, W. and Patrignani, M. (eds.) Proc. 20th Int. Sympos. Graph Drawing (GD'12). p. 463474. SpringerVerlag (2013).

Wismath, S., Wolff, A. eds: Proceedings of the 21st International Symposium on Graph Drawing (GD'13). SpringerVerlag (2013).

Kindermann, P., Niedermann, B., Rutter, I., Schaefer, M., Schulz, A., Wolff, A.: TwoSided Boundary Labeling with Adjacent Sides. In: Dehne, F., SolisOba, R., and Sack, J.R. (eds.) Proc. 13th Int. Algorithms Data Struct. Symp. (WADS'13). p. 463474. SpringerVerlag (2013).

Fink, M., Haunert, J.H., Spoerhase, J., Wolff, A.: Selecting the Aspect Ratio of a Scatter Plot Based on Its Delaunay Triangulation. In: Fekete, S. (ed.) Proc. 29th Europ. Workshop Comput. Geom. (EuroCG'13). p. 119122. , Braunschweig (2013).
2012 [ to top ]

Fink, M., Haunert, J.H., Mchedlidze, T., Spoerhase, J., Wolff, A.: Drawing Graphs with Vertices at Specified Positions and Crossings at Large Angles. In: Rahman, M.S. and Nakano, S.ichi (eds.) Proc. Workshop Algorithms Comput. (WALCOM'12). p. 186197. SpringerVerlag (2012).

Kobourov, S., Wolff, A., van Ham, F. eds: Putting Data on the Map. Schloss Dagstuhl~ LeibnizZentrum für Informatik (2012).

Buchin, K., Buchin, M., Byrka, J., Nöllenburg, M., Okamoto, Y., Silveira, R.I., Wolff, A.: Drawing (Complete) Binary Tanglegrams: Hardness, Approximation, FixedParameter Tractability. Algorithmica. 62, 309332 (2012).

Schwartges, N., Spoerhase, J., Wolff, A.: Approximation Algorithms for the Maximum Leaf Spanning Tree Problem on Acyclic Digraphs. In: SolisOba, R. and Persiano, G. (eds.) Proc. 9th Workshop Approx. Online Algorithms (WAOA'11). p. 7788. SpringerVerlag, Saarbr{ü}cken (2012).

Fink, M., Haunert, J.H., Schulz, A., Spoerhase, J., Wolff, A.: Algorithms for Labeling Focus Regions. IEEE Transactions on Visualization and Computer Graphics. 18, 25832592 (2012).

Das, A., Fleszar, K., Kobourov, S.G., Spoerhase, J., Veeramoni, S., Wolff, A.: Polylogarithmic Approximation for Generalized Minimum Manhattan Networks, http://arxiv.org/abs/1203.6481, (2012).

Rutter, I., Wolff, A.: Augmenting the Connectivity of Planar and Geometric Graphs. Journal of Graph Algorithms & Applications. 16, 599628 (2012).

Fink, M., Haunert, J.H., Mchedlidze, T., Spoerhase, J., Wolff, A.: Drawing Graphs with Vertices at Specified Positions and Crossings at Large Angles. In: van Kreveld, M. and Speckmann, B. (eds.) Proc. 19th Int. Sympos. Graph Drawing (GD'11). p. 441442. SpringerVerlag (2012).

Atienza, N., de Castro, N., Cortés, C., Garrido, M.Á., Grima, C.I., Hernández, G., Márquez, A., MorenoGonzález, A., Nöllenburg, M., Portillo, J.R., Reyes, P., Valenzuela, J., Villar, M.T., Wolff, A.: Cover Contact Graphs. Journal of Computational Geometry. 3, (2012).
2011 [ to top ]

Nöllenburg, M., Wolff, A.: Drawing and Labeling HighQuality Metro Maps by MixedInteger Programming. IEEE Transactions on Visualization and Computer Graphics. 17, 626641 (2011).

Das, A., Gansner, E.R., Kaufmann, M., Kobourov, S., Spoerhase, J., Wolff, A.: Approximating Minimum Manhattan Networks in Higher Dimensions. In: Demetrescu, C. and Halldórsson, M.M. (eds.) Proc. 19th Annu. Europ. Symp. on Algorithms (ESA'11). p. 4960. SpringerVerlag, Saarbr{ü}cken (2011).

Dykes, J., MüllerHannemann, M., Wolff, A. eds: Schematization in Cartography, Visualization, and Computational Geometry. , Schloss Dagstuhl (2011).
2010 [ to top ]

de Berg, M., Gerrits, D., Khosravi, A., Rutter, I., Tsirogiannis, C., Wolff, A.: How Alexander the Great Brought the Greeks Together While Inflicting Minimal Damage to the Barbarians. Proc. 26th European Workshop Comput. Geom. (EuroCG'10). p. 7376. , Dortmund (2010).

Been, K., Nöllenburg, M., Poon, S.H., Wolff, A.: Optimizing Active Ranges for Consistent Dynamic Map Labeling. Computational Geometry: Theory and Applications. 43, 312328 (2010).

Haunert, J.H., Wolff, A.: Area aggregation in map generalisation by mixedinteger programming. International Journal of Geographical Information Science. 24, 18711897 (2010).

Haunert, J.H., Wolff, A.: Optimal and Topologically Safe Simplification of Building Footprints. Proc. 18th Int. ACM Symp. Advances Geogr. Inform. Syst. (ACMGIS'10). p. 192201. , San Jose, CA (2010).

Erlebach, T., Hagerup, T., Jansen, K., Minzlaff, M., Wolff, A.: Trimming of Graphs, with Application to Point Labeling. Theory of Computing Systems. 47, 613636 (2010).

de Berg, M., van Nijnatten, F., Sitters, R., Woeginger, G.J., Wolff, A.: The Traveling Salesman Problem Under Squared Euclidean Distances. In: Marion, J.Y. and Schwentick, T. (eds.) Proc. 27th Int. Sympos. Theoretical Aspects Comput. Sci. (STACS'10). p. 239250. , Nancy (2010).

Katz, B., Krug, M., Rutter, I., Wolff, A.: ManhattanGeodesic Embedding of Planar Graphs. In: Eppstein, D. and Gansner, E.R. (eds.) Proc. 17th Int. Sympos. Graph Drawing (GD'09). p. 207218. SpringerVerlag (2010).

Rutter, I., Wolff, A.: Computing Large Matchings Fast. ACM Transactions on Algorithms. 7, article 1, 21 pages (2010).
2009 [ to top ]

Nöllenburg, M., Völker, M., Wolff, A., Holten, D.: Drawing Binary Tanglegrams: An Experimental Evaluation. Proc. 11th Workshop Algorithm Engineering and Experiments (ALENEX'09). p. 106119 (2009).

Goaoc, X., Kratochvíl, J., Okamoto, Y., Shin, C.S., Spillner, A., Wolff, A.: Untangling a Planar Graph. Discrete Computational Geometry. 42, 542569 (2009).

Buchin, K., Buchin, M., Byrka, J., Nöllenburg, M., Okamoto, Y., Silveira, R.I., Wolff, A.: Drawing (Complete) Binary Tanglegrams: Hardness, Approximation, FixedParameter Tractability. In: Tollis, I.G. and Patrignani, M. (eds.) Proc. 16th Int. Sympos. Graph Drawing (GD'08). p. 324335. SpringerVerlag, Hersonissos, Crete (2009).

Ahn, H.K., Alt, H., Asano, T., Bae, S.W., Brass, P., Cheong, O., Knauer, C., Na, H.S., Shin, C.S., Wolff, A.: Constructing Optimal Highways. International Journal of Foundations of Computer Science. 20, 323 (2009).

Bereg, S., Mutsanas, N., Wolff, A.: Matching Points with Rectangles and Squares. Computational Geometry: Theory and Applications. 42, 93108 (2009).

Keiren, J., van Walderveen, F., Wolff, A.: Constructability of Triplets. In: Langerman, S. (ed.) Proc. 25th European Workshop on Computational Geometry (EuroCG'09). , Brussels (2009).

Benkert, M., Gudmundsson, J., Knauer, C., van Oostrum, R., Wolff, A.: A PolynomialTime Approximation Algorithm for a Geometric Dispersion Problem. International Journal of Computational Geometry and Applications. 19, 267288 (2009).
2008 [ to top ]

Rutter, I., Wolff, A.: Augmenting the Connectivity of Planar and Geometric Graphs. Proc. Int. Conf. Topological Geom. Graph Theory (TGGT'08). p. 5356. , Paris (2008).

Buchin, K., Buchin, M., Byrka, J., Nöllenburg, M., Okamoto, Y., Silveira, R.I., Wolff, A.: Drawing (Complete) Binary Tanglegrams: Hardness, Approximation, FixedParameter Tractability, http://arxiv.org/abs/0806.0920, (2008).

Been, K., Nöllenburg, M., Poon, S.H., Wolff, A.: Optimizing Active Ranges for Consistent Dynamic Map Labeling. Proc. 24th Annu. ACM Sympos. Comput. Geom. (SoCG'08). p. 1019. , College Park, MD (2008).

Spillner, A., Wolff, A.: Untangling a Planar Graph. In: Geffert, V., Karhumäki, J., Bertoni, A., Preneel, B., Návrat, P., and Bieliková, M. (eds.) Proc. 34th Int. Conf. Current Trends Theory & Practice Comput. Sci. (SOFSEM'08). p. 473484. SpringerVerlag, Nov{{\'y}} Smokovec, Slovakia (2008).

Atienza, N., de Castro, N., Cortés, C., Garrido, M.Á., Grima, C.I., Hernández, G., Márquez, A., Moreno, A., Nöllenburg, M., Portillo, J.R., Reyes, P., Valenzuela, J., Villar, M.T., Wolff, A.: Cover Contact Graphs. In: Hong, S.H., Nishizeki, T., and Quan, W. (eds.) Proc. 15th Int. Sympos. Graph Drawing (GD'07). p. 171182. SpringerVerlag, Sydney (2008).

Goaoc, X., Kratochvíl, J., Okamoto, Y., Shin, C.S., Wolff, A.: Moving Vertices to Make Drawings Plane. In: Hong, S.H., Nishizeki, T., and Quan, W. (eds.) Proc. 15th Int. Sympos. Graph Drawing (GD'07). p. 101112. SpringerVerlag, Sydney (2008).

Rutter, I., Wolff, A.: Augmenting the Connectivity of Planar and Geometric Graphs. In: Petitjean, S. (ed.) Proc. 24th European Workshop on Computational Geometry (EuroCG'08). p. 7174. , Nancy (2008).

Gerdjikov, S., Wolff, A.: Decomposing a Simple Polygon into PseudoTriangles and Convex Polygons. Computational Geometry: Theory and Applications. 41, 2130 (2008).

Görke, R., Shin, C.S., Wolff, A.: Constructing the City Voronoi Diagram Faster. International Journal of Computational Geometry and Applications. 18, 275294 (2008).

Reinbacher, I., Benkert, M., van Kreveld, M., Mitchell, J.S.B., Snoeyink, J., Wolff, A.: Delineating Boundaries for Imprecise Regions. Algorithmica. 50, 386414 (2008).

Rutter, I., Wolff, A.: Augmenting the Connectivity of Planar and Geometric Graphs. Fakultät für Informatik, Universität Karlsruhe (2008).

Been, K., Nöllenburg, M., Poon, S.H., Wolff, A.: Optimizing Active Ranges for Consistent Dynamic Map Labeling. In: Petitjean, S. (ed.) Proc. 24th European Workshop on Computational Geometry (EuroCG'08). p. 5558. , Nancy (2008).

Rutter, I., Wolff, A.: Computing Large Matchings Fast. Proc. 19th ACMSIAM Sympos. Discrete Algorithms (SODA'08). p. 183192. , San Francisco (2008).

Benkert, M., Gudmundsson, J., Haverkort, H., Wolff, A.: Constructing InterferenceMinimal Networks. Computational Geometry: Theory and Applications. 40, 179194 (2008).

Nöllenburg, M., Merrick, D., Wolff, A., Benkert, M.: Morphing Polylines: A Step Towards Continuous Generalization. Computers, Environment and Urban Systems. 32, 248260 (2008).

Haunert, J.H., Wolff, A.: Optimal Simplification of Building Ground Plans. Proc. 21st Congress Int. Society Photogrammetry Remote Sensing (ISPRS'08), Technical Commision II/3. p. 373378. , Beijing (2008).

Erlebach, T., Hagerup, T., Jansen, K., Minzlaff, M., Wolff, A.: Trimming of Graphs, with Application to Point Labeling. In: Albers, S. and Weil, P. (eds.) Proc. 25th Int. Sympos. Theoretical Aspects Comput. Sci. (STACS'08). p. 265276. , Bordeaux (2008).
2007 [ to top ]

Bekos, M.A., Kaufmann, M., Symvonis, A., Wolff, A.: Boundary Labeling: Models and Efficient Algorithms for Rectangular Maps. Computational Geometry: Theory and Applications. 36, 215236 (2007).

Merrick, D., Nöllenburg, M., Wolff, A., Benkert, M.: Morphing Polygonal Lines: A Step Towards Continuous Generalization. Proc. 15th Annu. Geograph. Inform. Sci. Research Conf. UK (GISRUK'07). p. 390399. , Maynooth, Ireland (2007).

Merrick, D., Nöllenburg, M., Wolff, A., Benkert, M.: Morphing Polygonal Lines: A Step Towards Continuous Generalization. In: Aichholzer, O. and Hackl, T. (eds.) Proc. 23rd European Workshop on Computational Geometry (EWCG'07). p. 69. , Graz (2007).

Atienza, N., de Castro, N., Cortés, C., Garrido, M.Á., Grima, C.I., Hernández, G., Márquez, A., Moreno, A., Nöllenburg, M., Portillo, J.R., Reyes, P., Valenzuela, J., Villar, M.T., Wolff, A.: Cover Contact Graphs. Fakultät für Informatik, Universität Karlsruhe (2007).

Ahn, H.K., Alt, H., Asano, T., Bae, S.W., Brass, P., Cheong, O., Knauer, C., Na, H.S., Shin, C.S., Wolff, A.: Constructing Optimal Highways. In: Jay, B. and Gudmundsson, J. (eds.) Proc. 13th Conf. Computing: The Australasian Theory Sympos. (CATS'07). p. 714. Australian Computer Society, Ballarat, Australia (2007).

Gudmundsson, J., Klein, R., Narasimhan, G., Smid, M., Wolff, A. eds: Geometric Networks and Metric Space Embeddings. , Schloss Dagstuhl (2007).

Rutter, I., Wolff, A.: Computing Large Matchings Fast. Fakultät für Informatik, Universität Karlsruhe (2007).

Knauer, C., Schramm, É., Spillner, A., Wolff, A.: Configurations with Few Crossings in Topological Graphs. Computational Geometry: Theory and Applications. 37, 104114 (2007).

Benkert, M., Nöllenburg, M., Uno, T., Wolff, A.: Minimizing IntraEdge Crossings in Wiring Diagrams and Public Transport Maps. In: Kaufmann, M. and Wagner, D. (eds.) Proc. 14th Int. Sympos. Graph Drawing (GD'06). p. 270281. SpringerVerlag, Karlsruhe, Germany (2007).

Wolff, A.: Drawing Subway Maps: A Survey. Informatik~ Forschung & Entwicklung. 22, 2344 (2007).

Bereg, S., Völker, M., Wolff, A., Zhang, Y.: Straightening Drawings of Clustered Hierarchical Graphs. In: van Leeuwen, J., Italiano, G.F., van der Hoek, W., Meinel, C., Sack, H., and Plasil, F. (eds.) Proc. 33rd Int. Conf. Current Trends Theory & Practice Comput. Sci. (SOFSEM'07). p. 177186. SpringerVerlag, Harrachov, Czech Republic (2007).
2006 [ to top ]

Benkert, M., Gudmundsson, J., Knauer, C., Moet, E., van Oostrum, R., Wolff, A.: A PolynomialTime Approximation Algorithm for a Geometric Dispersion Problem. Fakultät für Informatik, Universität Karlsruhe (2006).

Nöllenburg, M., Wolff, A.: A MixedInteger Program for Drawing HighQuality Metro Maps. In: Healy, P. and Nikolov, N.S. (eds.) Proc. 13th Int. Sympos. Graph Drawing (GD'05). p. 321333. SpringerVerlag, Limerick, Ireland (2006).

Benkert, M., Gudmundsson, J., Knauer, C., Moet, E., van Oostrum, R., Wolff, A.: A PolynomialTime Approximation Algorithm for a Geometric Dispersion Problem. In: Chen, D.Z. and Lee, D.T. (eds.) Proc. 12th Annu. Int. Comput. Combinatorics Conf. (COCOON'06). p. 166175. SpringerVerlag, Taipei (2006).

Benkert, M., Wolff, A., Widmann, F., Shirabe, T.: The Minimum Manhattan Network Problem: Approximations and Exact Solutions. Computational Geometry: Theory and Applications. 35, 188208 (2006).

Haunert, J.H., Wolff, A.: Generalization of Land Cover Maps by Mixed Integer Programming. Proc. 14th Int. ACM Symp. Advances Geogr. Inform. Syst. (ACMGIS'06). p. 7582. , Arlington, VA (2006).

Daescu, O., Mi, N., Shin, C.S., Wolff, A.: FarthestPoint Queries with Geometric and Combinatorial Constraints. Computational Geometry: Theory and Applications. 33, 174185 (2006).

Benkert, M., Gudmundsson, J., Haverkort, H., Wolff, A.: Constructing InterferenceMinimal Networks. In: Wiedermann, J. r\'i, Stuller, J., Tel, G., Pokorn'y, J., and Bieliková, M. (eds.) Proc. 32nd Int. Conf. Current Trends Theory & Practice Comput. Sci. (SOFSEM'06). p. 166175. SpringerVerlag, Merin, Czech Republic (2006).

Halldórsson, M.M., Wolff, A., Tokuyama, T.: Improved FixedParameter Algorithms for NonCrossing Subgraphs. Proc. ICALP Affiliated Workshop on Improving ExponentialTime Algorithms (iETA'06). p. 3138. , Venezia (2006).

Rüetschi, U.J., Caduff, D., Timpf, S., Schulz, F., Wolff, A.: Routing by Landmarks. Proc. 6th Swiss Transport Research Conf. (STRC'06). , Ascona (2006).

Benkert, M., Gudmundsson, J., Knauer, C., Moet, E., van Oostrum, R., Wolff, A.: A PolynomialTime Approximation Algorithm for a Geometric Dispersion Problem. Proc. 22nd European Workshop on Computational Geometry (EWCG'06). p. 141144. , Delphi (2006).

Bereg, S., Mutsanas, N., Wolff, A.: Matching Points with Rectangles and Squares. In: Wiedermann, J. r\'i, Stuller, J., Tel, G., Pokorn'y, J., and Bieliková, M. (eds.) Proc. 32nd Int. Conf. Current Trends Theory & Practice Comput. Sci. (SOFSEM'06). p. 177186. SpringerVerlag, Merin, Czech Republic (2006).

Erlebach, T., Hagerup, T., Jansen, K., Minzlaff, M., Wolff, A.: A New Approximation Algorithm for Labeling Weighted Points with Sliding Labels. Proc. 22nd European Workshop on Computational Geometry (EWCG'06). p. 137140. , Delphi (2006).

Bereg, S., Völker, M., Wolff, A.: Compact Drawing of Clustered Layered Graphs, (2006).

Gerdjikov, S., Wolff, A.: PseudoConvex Decomposition of Simple Polygons. Proc. 22nd European Workshop on Computational Geometry (EWCG'06). p. 1316. , Delphi (2006).
2005 [ to top ]

Reinbacher, I., Benkert, M., van Kreveld, M., Mitchell, J.S.B., Wolff, A.: Delineating Boundaries for Imprecise Regions. In: Brodal, G.S. and Leonardi, S. (eds.) Proc. 13th Annu. Europ. Symp. on Algorithms (ESA'05). p. 143154. SpringerVerlag, Eivissa, Spain (2005).

Wolff, A.: Geometrische Netzwerke und ihre Visualisierung, (2005).

Benkert, M., Gudmundsson, J., Haverkort, H., Wolff, A.: Constructing InterferenceMinimal Networks. Proc. 21st European Workshop on Computational Geometry (EWCG'05). p. 203206. , Eindhoven (2005).

Bekos, M.A., Kaufmann, M., Symvonis, A., Wolff, A.: Boundary Labeling: Models and Efficient Algorithms for Rectangular Maps. In: Pach, J. (ed.) Proc. 12th Int. Sympos. Graph Drawing (GD'04). p. 4959. SpringerVerlag, New York (2005).

Knauer, C., Schramm, É., Spillner, A., Wolff, A.: Spanning Trees with Few Crossings in Geometric and Topological Graphs. Proc. 21st European Workshop on Computational Geometry (EWCG'05). p. 195198. , Eindhoven (2005).

Reinbacher, I., Benkert, M., van Kreveld, M., Wolff, A.: Delineating Boundaries for Imprecise Regions. Proc. 21st European Workshop on Computational Geometry (EWCG'05). p. 127130. , Eindhoven (2005).

Knauer, C., Schramm, É., Spillner, A., Wolff, A.: Configurations with Few Crossings in Topological Graphs. Fakultät für Informatik, Universität Karlsruhe (2005).

Görke, R., Wolff, A.: Constructing the City Voronoi Diagram Faster. Proc. 2nd Int. Symp. on Voronoi Diagrams in Science and Engineering (VD'05). p. 162172. , Seoul (2005).

Görke, R., Wolff, A.: Constructing the City Voronoi Diagram Faster. Proc. 21st European Workshop on Computational Geometry (EWCG'05). p. 155158. , Eindhoven (2005).

Benkert, M., Widmann, F., Wolff, A.: The Minimum Manhattan Network Problem: A Fast Factor3 Approximation. In: Akiyama, J., Kano, M., and Tan, X. (eds.) Proc. 8th Japanese Conf. on Discrete and Computational Geometry (JCDCG'04). p. 1628. SpringerVerlag, Tokyo (2005).

Daescu, O., Mi, N., Shin, C.S., Wolff, A.: FarthestPoint Queries with Geometric and Combinatorial Constraints. In: Akiyama, J., Kano, M., and Tan, X. (eds.) Proc. 8th Japanese Conf. on Discrete and Computational Geometry (JCDCG'04). p. 6275. SpringerVerlag, Tokyo (2005).

Asano, T., de Berg, M., Cheong, O., Everett, H., Haverkort, H., Katoh, N., Wolff, A.: Optimal Spanners for AxisAligned Rectangles. Computational Geometry: Theory and Applications. 30, 5977 (2005).

Knauer, C., Schramm, É., Spillner, A., Wolff, A.: Configurations with Few Crossings in Topological Graphs. In: Deng, X. and Du, D.Z. (eds.) Proc. 16th Annu. Int. Symp. Algorithms Comput. (ISAAC'05). p. 604613. SpringerVerlag, Sanya, Hainan, China (2005).
2004 [ to top ]

Daescu, O., Mi, N., Shin, C.S., Wolff, A.: FarthestPoint Queries with Geometric and Combinatorial Constraints. Abstracts 8th Japanese Conf. on Discrete and Computational Geometry (JCDCG'04). p. 110111. , Tokyo (2004).

Arampatzis, A., van Kreveld, M., Reinbacher, I., Jones, C.B., Vaid, S., Clough, P., Joho, H., Sanderson, M., Benkert, M., Wolff, A.: WebBased Delineation of Imprecise Regions. Proc. Workshop on Geographic Information Retrieval at SIGIR'04. , Sheffield (2004).

van Kreveld, M., Schramm, É., Wolff, A.: Algorithms for the Placement of Diagrams on Maps. In: Pfoder, D., Cruz, I.F., and Ronthaler, M. (eds.) Proc. 12th Int. ACM Symp. Advances Geogr. Inform. Syst. (ACMGIS'04). p. 222231. , Washington D.C. (2004).

Benkert, M., Widmann, F., Wolff, A.: The Minimum Manhattan Network Problem: A Fast Factor3 Approximation. Fakultät für Informatik, Universität Karlsruhe (2004).

Gudmundsson, J., Haverkort, H., Park, S.M., Shin, C.S., Wolff, A.: Facility Location and the Geometric MinimumDiameter Spanning Tree. Computational Geometry: Theory and Applications. 27, 87106 (2004).

Daescu, O., Mi, N., Shin, C.S., Wolff, A.: FarthestPoint Queries with Geometric and Combinatorial Constraints. Proc. 20th European Workshop on Computational Geometry (EWCG'04). p. 4548. , Sevilla (2004).

Bekos, M.A., Kaufmann, M., Symvonis, A., Wolff, A.: Boundary Labeling: Models and Efficient Algorithms for Rectangular Maps. Fakultät für Informatik, Universität Karlsruhe (2004).

Wolff, A., Benkert, M., Shirabe, T.: The Minimum Manhattan Network Problem: Approximations and Exact Solutions. Proc. 20th European Workshop on Computational Geometry (EWCG'04). p. 209212. , Sevilla (2004).

Benkert, M., Widmann, F., Wolff, A.: The Minimum Manhattan Network Problem: A Fast Factor3 Approximation. Abstracts 8th Japanese Conf. on Discrete and Computational Geometry (JCDCG'04). p. 8586. , Tokyo (2004).

Asano, T., de Berg, M., Cheong, O., Everett, H., Haverkort, H., Katoh, N., Wolff, A.: Optimal Spanners for AxisAligned Rectangles. Proc. 20th European Workshop on Computational Geometry (EWCG'04). p. 97100. , Sevilla (2004).

Asano, T., de Berg, M., Cheong, O., Everett, H., Haverkort, H., Katoh, N., Wolff, A.: Optimal Spanners for AxisAligned Rectangles. Department of Computer Science, Utrecht University (2004).
2003 [ to top ]

Poon, S.H., Shin, C.S., Strijk, T., Uno, T., Wolff, A.: Labeling Points with Weights. Algorithmica. 38, 341362 (2003).
2002 [ to top ]

Kapoor, V., Kühl, D., Wolff, A.: A Tutorial for Designing Flexible Geometric Algorithms. Algorithmica. 33, 5270 (2002).

Wolff, A., Thon, M., Xu, Y.: A Simple Factor2/3 Approximation Algorithm for TwoCircle Point Labeling. International Journal of Computational Geometry and Applications. 12, 269281 (2002).

Gudmundsson, J., Haverkort, H., Park, S.M., Shin, C.S., Wolff, A.: Approximating the Geometric MinimumDiameter Spanning Tree. Institut für Mathematik und Informatik, Universität Greifswald (2002).

van Dijk, S., van Kreveld, M., Strijk, T., Wolff, A.: Towards an Evaluation of Quality for Names Placement Methods. International Journal of Geographical Information Science. 16, 641661 (2002).

Gudmundsson, J., Haverkort, H., Park, S.M., Shin, C.S., Wolff, A.: Approximating the Geometric MinimumDiameter Spanning Tree. Proc. 18th European Workshop on Computational Geometry (EWCG'02). p. 4145. , Warszawa (2002).

Bach, K., Hanig, K., Hoffmann, T., Kresse, W., Löcherbach, J., Rosenthal, P., Rudnick, S., Schreiber, P., Thon, M., Wolff, A.: Beschriftungsalgorithmen in Theorie & Praxis. Institut für Mathematik und Informatik, Universität Greifswald (2002).

Gudmundsson, J., Haverkort, H., Park, S.M., Shin, C.S., Wolff, A.: Facility Location and the Geometric MinimumDiameter Spanning Tree. In: Jansen, K., Leonardi, S., and Vazirani, V. (eds.) Proc. 5th Int. Workshop Approx. Algorithms Combin. Optim. (APPROX'02). p. 146160. SpringerVerlag, Roma (2002).
2001 [ to top ]

Poon, S.H., Shin, C.S., Strijk, T., Wolff, A.: Labeling Points with Weights. Institut für Mathematik und Informatik, Universität Greifswald (2001).

Wagner, F., Wolff, A., Kapoor, V., Strijk, T.: Three Rules Suffice for Good Label Placement. Algorithmica. 30, 334349 (2001).

Poon, S.H., Shin, C.S., Strijk, T., Wolff, A.: Labeling Points with Weights. Proc. 17th European Workshop on Computational Geometry (EWCG'01). p. 97100. , Berlin (2001).

Garrido, M.Á., Márquez, A., Iturriaga, C., Portillo, J.R., Reyes, P., Wolff, A.: Etiquetado de puntos alineados. Proc. IX Encuentros de Geometría Computacional (EGC'01). p. 285294. , Girona (2001).[ BibTeX ]

Garrido, M.Á., Iturriaga, C., Márquez, A., Portillo, J.R., Reyes, P., Wolff, A.: Labeling Subway Lines. In: Eades, P. and Takaoka, T. (eds.) Proc. 12th Annu. Int. Symp. Algorithms Comput. (ISAAC'01). p. 649659. SpringerVerlag, Christchurch (2001).

Poon, S.H., Shin, C.S., Strijk, T., Wolff, A.: Labeling Points with Weights. In: Eades, P. and Takaoka, T. (eds.) Proc. 12th Annu. Int. Symp. Algorithms Comput. (ISAAC'01). p. 610622. SpringerVerlag, Christchurch (2001).

van Dijk, S., van Kreveld, M., Strijk, T., Wolff, A.: Towards an Evaluation of Quality for Names Placement Methods. Department of Computer Science, Utrecht University (2001).

Strijk, T., Wolff, A.: Labeling Points with Circles. International Journal of Computational Geometry and Applications. 11, 181195 (2001).

Wolff, A., Knipping, L., van Kreveld, M., Strijk, T., Agarwal, P.K.: A Simple and Efficient Algorithm for HighQuality Line Labeling. Department of Computer Science, Utrecht University (2001).
2000 [ to top ]

Kapoor, V., Kühl, D., Wolff, A.: A Generic Design Concept for Geometric Algorithms. Institut für Informatik, Fachbereich Mathematik und Informatik, Freie Universität Berlin (2000).

Wolff, A., Knipping, L., van Kreveld, M., Strijk, T., Agarwal, P.K.: A Simple and Efficient Algorithm for HighQuality Line Labeling. In: Atkinson, P.M. and Martin, D.J. (eds.) Innovations in GIS VII: GeoComputation. p. 147159. Taylor & Francis (2000).

Qin, Z., Wolff, A., Xu, Y., Zhu, B.: New Algorithms for TwoLabel Point Labeling. In: Paterson, M. (ed.) Proc. 8th Annu. Europ. Symp. on Algorithms (ESA'00). p. 368379. SpringerVerlag, Saarbr{ü}cken (2000).

Qin, Z., Wolff, A., Xu, Y., Zhu, B.: New Algorithms for TwoLabel Point Labeling. Hongkong University of Science and Technology (2000).

Wolff, A., Thon, M., Xu, Y.: A Better Lower Bound for TwoCircle Point Labeling. In: Lee, D.T. and Teng, S.H. (eds.) Proc. 11th Annu. Int. Symp. Algorithms Comput. (ISAAC'00). p. 422431. SpringerVerlag, Taipei (2000).

Thon, M., Wolff, A., Xu, Y.: Ein neuer Algorithmus zur Beschriftung von Punkten mit je zwei Kreisen. In: Gesellschaft für Informatik e.V., (ed.) Tagungsband der Informatiktage. , Bad Schussenried (2000).[ BibTeX ]

Wolff, A.: A Simple Proof for the NPHardness of Edge Labeling. Institut für Mathematik und Informatik, Universität Greifswald (2000).
1999 [ to top ]

Agarwal, P.K., Knipping, L., van Kreveld, M., Strijk, T., Wolff, A.: A Simple and Efficient Algorithm for HighQuality Line Labeling. Proc. 15th European Workshop on Computational Geometry (EWCG'99). p. 9396. , SophiaAntipolis (1999).[ BibTeX ]

Wagner, F., Wolff, A.: A Combinatorial Framework for Map Labeling. In: Whitesides, S.H. (ed.) Proc. 6th Int. Sympos. Graph Drawing (GD'98). p. 316331. SpringerVerlag, Montr{é}al (1999).

van Kreveld, M., Strijk, T., Wolff, A.: Point Labeling with Sliding Labels. Computational Geometry: Theory and Applications. 13, 2147 (1999).

Wolff, A., Knipping, L., van Kreveld, M., Strijk, T., Agarwal, P.K.: A Simple and Efficient Algorithm for HighQuality Line Labeling. In: Martin, D. and Wu, F. (eds.) Proc. 7th Annu. Geograph. Inform. Sci. Research Conf. UK (GISRUK'99). p. 146150. , Southampton (1999).[ BibTeX ]

Strijk, T., Wolff, A.: Labeling Points with Circles. Institut für Informatik, Freie Universität Berlin (1999).[ BibTeX ]

van Dijk, S., van Kreveld, M., Strijk, T., Wolff, A.: Towards an Evaluation of Quality for Label Placement Methods. Proc. 19th Int. Cartographic Conf. (ICA'99). p. 905913. Int. Cartographic Association, Ottawa (1999).

Wolff, A.: Automated Label Placement in Theory and Practice, (1999).
1998 [ to top ]

Wolff, A.: The Hardness of Approximating Set Cover. In: Mayr, E.W., Prömel, H.J., and Steger, A. (eds.) Lectures on Proof Verification and Approximation Algorithms. p. 249262. SpringerVerlag (1998).

van Kreveld, M., Strijk, T., Wolff, A.: Point Set Labeling with Sliding Labels. Department of Computer Science, Utrecht University (1998).

van Kreveld, M., Strijk, T., Wolff, A.: Point Set Labeling with Sliding Labels. Proc. 14th Annu. ACM Sympos. Comput. Geom. (SoCG'98). p. 337346. , Minneapolis (1998).

Schönherr, S., Wolff, A.: MakeIt!  Generating and Maintaining Makefiles Automatically. In: Battini, R. and Bertossi, A.A. (eds.) Proc. Workshop on Algorithms and Experiments (ALEX'98). p. 165174. , Trento (1998).
1997 [ to top ]

Wagner, F., Wolff, A.: A Practical Map Labeling Algorithm. Computational Geometry: Theory and Applications. 7, 387404 (1997).

van Kreveld, M., Neyer, G., Schirra, S., Rickenbach, R., Wagner, F., Widmayer, P., Wolff, A.: Geographic Information Systems, (1997).[ BibTeX ]
1996 [ to top ]

Wolff, A., Strijk, T.: The MapLabeling Bibliography, http://i11www.ira.uka.de/maplabeling/bibliography/, (1996).
1995 [ to top ]

Wagner, F., Wolff, A.: Map Labeling Heuristics: Provably Good and Practically Useful. Institut für Informatik, Freie Universität Berlin (1995).[ BibTeX ]

Wagner, F., Wolff, A.: Fast and Reliable Map Labeling. In: und Werner Pillmann, H.K. (ed.) Proc. 9th Int. Symp. Computer Science for Environment Protection (CSEP'95). p. 667675. Metropolis, Berlin (1995).[ BibTeX ]

Wagner, F., Wolff, A.: Map Labeling Heuristics: Provably Good and Practically Useful. Proc. 11th Annu. ACM Sympos. Comput. Geom. (SoCG'95). p. 109118. , Vancouver (1995).

Wolff, A.: Map Labeling, (1995).[ BibTeX ]

Wagner, F., Wolff, A.: An Efficient and Effective Approximation Algorithm for the Map Labeling Problem. In: Spirakis, P. (ed.) Proc. 3rd Annu. Europ. Symp. on Algorithms (ESA'95). p. 420433. SpringerVerlag, Corfu (1995).