@misc{indiciae5a552b24b041,
  title = {Mars gravity field model from Mariner 9, Viking 1 and 2 data},
  author = {Balmino, G. and Moynot, B. and Christensen, E. J. and Roucher, P. and Vales, N.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800053556},
  note = {Source identifier: 19800053556}
}