@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/