@article{GDZPPN001186507, title = {Shape-from-Shading, viscosity solutions and edges.}, journal = {Numerische Mathematik}, volume = {66}, year = {1993}, pages = {323-354}, zbl = {0804.68160}, url = {http://dml.mathdoc.fr/item/GDZPPN001186507} }
Lions, P.L.; Rouy, E.; Tourin, A. Shape-from-Shading, viscosity solutions and edges.. Numerische Mathematik, Tome 66 (1993) pp. 323-354. http://gdmltest.u-ga.fr/item/GDZPPN001186507/