@misc{indiciaea52539a9b7e8,
  title = {Radar determination of Mars surface properties},
  author = {Simpson, Richard A. and Harmon, John K. and Zisk, Stanley H. and Thompson, T. W. and Muhleman, Duane O.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930043875},
  note = {Source identifier: 19930043875}
}