@misc{indiciaeef6c90b22ecf,
  title = {Phobos and Deimos astrometric observations from Mariner 9},
  author = {Duxbury, T. C. and Callahan, J. D.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890058635},
  note = {Source identifier: 19890058635}
}