@article{hay-94-psmot,
  author = {Hideki Hayakawa},
  title = {Photometric Stereo Under a Light Source with Arbitrary Motion},
  journal = {Journal of the Optical Society of America, Series A (JOSAA)},
  volume = {11},
  number = {11},
  pages = {3079--3089},
  year = 1994,
  month = nov,
  altkeys = {hay-NN-psmot}
}