@inproceedings{photometricstereousingconstrained,
  title = {Photometric Stereo using Constrained Bivariate Regression for General Isotropic Surfaces},
  author = {Satoshi Ikehata and Kiyoharu Aizawa},
  year = {2014},
  booktitle = {CVPR 2014 6},
  url = {http://openaccess.thecvf.com/content_cvpr_2014/html/Ikehata_Photometric_Stereo_using_2014_CVPR_paper.html},
}