@article{dre-fun-92-varint,
  author = {Drew, M. S. and Funt, B. V.},
  title = {Variational Approach to Interreflection in Color Images},
  journal = {Journal of the Optical Society of America, Series A (???JOSA-A)},
  volume = {9},
  number = {8},
  pages = {1255--1265},
  year = 1992,
  altkeys = {Drew92}
}