@article{sun-smi-smi-far-07-threelit,
  author = {J. Sun and M. L. Smith and L. N. Smith and A Farooq}, 
  title = {Examining the Uncertainty of the Recovered Surface Normal in Three Light Photometric Stereo},
  journal = {Image and Vision Computing Special Issue on Computer Vision Applications},
  volume = {25},
  pages = {1073--1079},
  year = 2007
}