Julien Mille Romuald Boné Pascal Makris Hubert Cardot Exploring Boundary Concavities in Active Contours and Surfaces. 1093-1100 2006 conf/3dpvt/2006 3DPVT http://doi.ieeecomputersociety.org/10.1109/3DPVT.2006.58 db/conf/3dpvt/3dpvt2006.html#MilleBMC06