@misc{indiciae1bd4a4511623,
  title = {Slope variations on the surface of Phobos},
  author = {Muinonen, Karri and Lumme, Kari and Irvine, William M.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910044970},
  note = {Source identifier: 19910044970}
}