@InCollection{zbMATH01055042,
Author = {J. {Chabrowski} and Kewei {Zhang}},
Title = {{On shape from shading problem}},
BookTitle = {{Functional analysis, approximation theory and numerical analysis. Dedicated to Stefan Banach on his 100th birthday, Alexander Markowi\c{c} Ostrowski on his 99th birthday, Stanislaw Marcin Ulam on his 83rd birthday}},
ISBN = {981-02-0737-9/hbk},
Pages = {93--105},
Year = {1994},
Publisher = {Singapore: World Scientific},
Language = {English},
MSC2010 = {35F20 35A15},
Zbl = {0878.35026}
}