no. 1
Instability of the eikonal equation and shape from shading
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 34 (2000) no. 1, pp. 127-138. 
@article{M2AN_2000__34_1_127_0,
     author = {Barnes, Ian and Zhang, Kewei},
     title = {Instability of the eikonal equation and shape from shading},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {127--138},
     publisher = {Dunod},
     address = {Paris},
     volume = {34},
     number = {1},
     year = {2000},
     zbl = {0973.35017},
     mrnumber = {1735973},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_2000__34_1_127_0/}
}
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Barnes, Ian; Zhang, Kewei. Instability of the eikonal equation and shape from shading. ESAIM: Mathematical Modelling and Numerical Analysis , Volume 34 (2000) no. 1, pp. 127-138. http://archive.numdam.org/item/M2AN_2000__34_1_127_0/

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