@inproceedings{red-agr-che-09-errcor,
  title = {Enforcing Integrability by Error Correction using {$\ell_1$}-Minimization},
  author = {Dikpal Reddy and Amit Agrawal and Rama Chellappa},
  booktitle = {Proc.~2009 IEEE Conference on Computer Vision and Pattern Recognition},
  year = 2009,
  pages = {2350--2357},
  comment = {Overviews previous methods. Discusses outliers in photometric stereo. Discusses curl removal using $\ell_1$ instead of $\ell_2$ as a way of handling outliers.  Says the mesh is an expander graph but that is incorrect. Compares various algorithms with noise and/or outliers.  Includes shapelets.} 
}