@article{analysisandapproximationofsomeshapefrom,
  title = {Analysis and approximation of some Shape-from-Shading models for non-Lambertian surfaces},
  author = {Silvia Tozza and Maurizio Falcone},
  year = {2015},
  eprint = {1502.05197},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1502.05197v2},
}