Nicolas Catusse, Victor Chepoi, Yann Vaxès. Planar Hop Spanners for Unit Disk Graphs. In Christian Scheideler, editor, Algorithms for Sensor Systems - 6th International Workshop on Algorithms for Sensor Systems, Wireless Ad Hoc Networks, and Autonomous Mobile Entities, ALGOSENSORS 2010, Bordeaux, France, July 5, 2010, Revised Selected Papers. Volume 6451 of Lecture Notes in Computer Science, pages 16-30, Springer, 2010. [doi]