@article{AIHPC_1993__10_4_363_0, author = {Chabrowski, Jan and Kewei, Zhang}, title = {On variational approach to photometric stereo}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, pages = {363--375}, publisher = {Gauthier-Villars}, volume = {10}, number = {4}, year = {1993}, mrnumber = {1246457}, zbl = {0821.49027}, language = {en}, url = {http://archive.numdam.org/item/AIHPC_1993__10_4_363_0/} }