@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/}
}