Annette Ebbers-Baumann Rolf Klein Elmar Langetepe Andrzej Lingas A fast algorithm for approximating the detour of a polygonal chain. 123-134 2004 27 Comput. Geom. 2 http://dx.doi.org/10.1016/S0925-7721(03)00046-4 db/journals/comgeo/comgeo27.html#Ebbers-BaumannKLL04