William Lenhart Richard Pollack Jörg-Rüdiger Sack Raimund Seidel Micha Sharir Subhash Suri Godfried T. Toussaint Sue Whitesides Chee-Keng Yap Computing the Link Center of a Simple Polygon. 1-10 1987 Symposium on Computational Geometry http://doi.acm.org/10.1145/41958.41959 db/conf/compgeom/compgeom87.html#LenhartPSSSSTWY87