@misc{indiciae6826e5c40f8a,
  title = {Phobos Ephemeris Improvement from Recent Spacecraft Observations},
  author = {Bills, B. G. and Neumann, G. A. and Smith, D. E. and Zuber, M. T.},
  year = {2004},
  url = {https://ntrs.nasa.gov/citations/20040171856},
  note = {Source identifier: 20040171856}
}