Christophe Lohou Gilles Bertrand A New 3D 6-Subiteration Thinning Algorithm Based on P-Simple Points. 102-113 2002 conf/dgci/2002 DGCI http://link.springer.de/link/service/series/0558/bibs/2301/23010102.htm db/conf/dgci/dgci2002.html#LohouB02