Lyudmil Aleksandrov Hristo Djidjev Hua Guo Anil Maheshwari Doron Nussbaum Jörg-Rüdiger Sack Approximate Shortest Path Queries on Weighted Polyhedral Surfaces. 98-109 2006 conf/mfcs/2006 MFCS http://dx.doi.org/10.1007/11821069_9 db/conf/mfcs/mfcs2006.html#AleksandrovDGMNS06