@misc{indiciae7e32ce2d3d97,
  title = {Photometric functions for photoclinometry and other applications},
  author = {A. S. McEwen},
  year = {1991},
  doi = {10.1016/0019-1035(91)90053-v},
  url = {https://pubs.usgs.gov/publication/70016679},
  note = {Source identifier: 70016679}
}