@article{9388,
  author = {G. Rybicki},
  title = {A note on the computation of diffuse reflection functions for spherical shells},
  year = {1970},
  journal = {Journal of Computational Physics},
  volume = {6},
  pages = {131-135},
  month = {Jan-08-1970},
  issn = {00219991},
  url = {http://linkinghub.elsevier.com/retrieve/pii/0021999170900112},
  doi = {10.1016/0021-9991(70)90011-2},
}