21. CCCG 2009: Vancouver, British Columbia, Canada

• Wenqi Ju, Jun Luo:
  New Algorithms for Computing Maximum Perimeter and Maximum Area of the Convex Hull of Imprecise Inputs Based On the Parallel Line Segment Model. 1-4
  
• Hee-Kap Ahn, Sang Won Bae, Iris Reinbacher:
  Optimal Empty Pseudo-Triangles in a Point Set. 5-8
  
• Yves Brise, Bernd Gärtner:
  Clarkson's Algorithm for Violator Spaces. 9-12
  
• Christian A. Duncan:
  On Graph Thickness, Geometric Thickness, and Separator Theorems. 13-16
  
• Alejandro Estrella-Balderrama, J. Joseph Fowler, Stephen G. Kobourov:
  Colored Simultaneous Geometric Embeddings and Universal Pointsets. 17-20
  
• Carla Binucci, Emilio Di Giacomo, Walter Didimo, Alejandro Estrella-Balderrama, Fabrizio Frati, Stephen G. Kobourov, Giuseppe Liotta:
  On Directed Graphs with an Upward Straight-line. 21-24
  
• Pedro J. Tejada, Xiaojun Qi, Minghui Jiang:
  Computational Geometry of Contour Extraction. 25-28
  
• Takashi Horiyama, Masato Samejima:
  Enumeration of Polyominoes for p4 Tiling. 29-32
  
• Dania El-Khechen, Muriel Dulieu, John Iacono, Nikolaj van Omme:
  Packing 2×2 unit squares into grid polygons is NP-complete. 33-36
  
• Michael M. Kazhdan, Nina Amenta, Shengyin Gu, David F. Wiley, Bernd Hamann:
  Symmetry Restoration by Stretching. 37-40
  
• Jürgen Bokowski, Vincent Pilaud:
  On symmetric realizations of the simplicial complex of 3-crossing-free sets of diagonals of the octagon. 41-44
  
• Md. Shafiul Alam, Asish Mukhopadhyay, Animesh Sarker:
  Generalized jewels and the point placement problem. 45-48
  
• Pavol Hell:
  Generalizations of Interval Graphs. 49
  
• Michael D. Adams:
  A Comparison of Two Fully-Dynamic Delaunay Triangulation Methods. 51-54
  
• Chris Gray, Maarten Löffler, Rodrigo I. Silveira:
  Minimizing Slope Change in Imprecise 1.5D terrains. 55-58
  
• Ahmad Biniaz:
  Slope Preserving Terrain Simplification - An Experimental Study. 59-62
  
• Louis Theran:
  Rigid Components of Random Graphs. 63-66
  
• Audrey Lee-St. John, Ileana Streinu:
  Angular rigidity in 3D: combinatorial characterizations and algorithms. 67-70
  
• Jialong Cheng, Meera Sitharam, Ileana Streinu:
  Nucleation-free 3D rigidity. 71-74
  
• Erik D. Demaine, Joseph O'Rourke:
  Open Problems from CCCG 2008. 75-78
  
• Gary L. Miller, Todd Phillips, Donald Sheehy:
  The Centervertex Theorem for Wedge Depth. 79-82
  
• Hamid Zarrabi-Zadeh, Asish Mukhopadhyay:
  Streaming 1-Center with Outliers in High Dimensions. 83-86
  
• Tetsuo Asano, Günter Rote:
  Constant-Working-Space Algorithms for Geometric Problems. 87-90
  
• David Flores-Peñaloza, Francisco Javier Zaragoza Martínez:
  Every four-colorable graph is isomorphic to a subgraph of the Visibility Graph of the Integer Lattice. 91-94
  
• Fabrizio Frati:
  Planar Packing of Diameter-Four Trees. 95-98
  
• Zachary Abel, Brad Ballinger, Prosenjit Bose, Sébastien Collette, Vida Dujmovic, Ferran Hurtado, Scott D. Kominers, Stefan Langerman, Attila Pór, David R. Wood:
  Every Large Point Set contains Many Collinear Points or an Empty Pentagon. 99-102
  
• Erin W. Chambers, David Letscher:
  On the Height of a Homotopy. 103-106
  
• Anil Maheshwari, Jörg-Rüdiger Sack, Kaveh Shahbaz:
  Computing Fréchet Distance with Speed Limits. 107-110
  
• Mark-Christoph Körner, Jack Brimberg, Henrik Juel, Anita Schöbel:
  General minisum circle location. 111-114
  
• Joondong Kim, Joseph S. B. Mitchell, Jingyu Zou:
  Approximating Maximum Flow in Polygonal Domains using Spanners. 115-118
  
• Marc J. van Kreveld:
  Bold Graph Drawings. 119-122
  
• Vishal Verma, Jack Snoeyink:
  Defining and computing accessibility radius. 123-126
  
• Leonidas J. Guibas:
  Intrinsic Multiscale Geometry. 127
  
• Ananda Swarup Das, Prosenjit Gupta, Kannan Srinathan:
  Data Structures for Reporting Extension Violations in a Query Range. 129-132
  
• Saladi Rahul, Prosenjit Gupta, K. S. Rajan:
  Data Structures for Range Aggregation by Categories. 133-136
  
• Yoshio Okamoto, Ryuhei Uehara:
  How to make a picturesque maze. 137-140
  
• Minghui Jiang:
  An Inequality on the Edge Lengths of Triangular Meshes. 141-144
  
• Erik D. Demaine, Sándor P. Fekete, Günter Rote, Nils Schweer, Daria Schymura, Mariano Zelke:
  Integer Point Sets Minimizing Average Pairwise l₁ Distance: What is the Optimal Shape of a Town? 145-148
  
• Tobias Christ, Michael Hoffmann:
  Wireless Localization with Vertex Guards is NP-hard. 149-152
  
• Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Kun Xu:
  Inapproximability of the Perimeter Defense Problem. 153-156
  
• Jonathan Backer, J. Mark Keil:
  The Bichromatic Rectangle Problem in High Dimensions. 157-160
  
• Shiliang Cui, Iyad A. Kanj, Ge Xia:
  On the Dilation of Delaunay Triangulations of Points in Convex Position. 161-164
  
• Prosenjit Bose, Luc Devroye, Maarten Löffler, Jack Snoeyink, Vishal Verma:
  The spanning ratio of the Delaunay triangulation is greater than pi/2. 165-167
  
• Prosenjit Bose, Jean Cardinal, Sébastien Collette, Erik D. Demaine, Belén Palop, Perouz Taslakian, Norbert Zeh:
  Relaxed Gabriel Graphs. 169-172
  
• Raimund Seidel:
  Teaching Computational Geometry, II. 173
  

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