%0 Journal Article %A Barnes, Ian %A Zhang, Kewei %T Instability of the eikonal equation and shape from shading %J ESAIM: Mathematical Modelling and Numerical Analysis %D 2000 %P 127-138 %V 34 %N 1 %I Dunod %C Paris %U http://geodesic.mathdoc.fr/item/M2AN_2000__34_1_127_0/ %G en %F M2AN_2000__34_1_127_0