Fabien Vivodtzev Georges-Pierre Bonneau Paul Le Texier Topology-preserving simplification of 2D nonmanifold meshes with embedded structures. 679-688 2005 21 The Visual Computer 8-10 http://dx.doi.org/10.1007/s00371-005-0334-y db/journals/vc/vc21.html#VivodtzevBT05