SHARAD Soundings and Surface Roughness at Past, Present, and Proposed Landing Sites on Mars: Reflections at Phoenix may be Attributable to Deep Ground IceDOI: info:10.1002/2014JE004646v. 119No. 8Wiley-Blackwell1936–1949
Putzig, Nathaniel E., Philips, Roger J., Campbell, Bruce A., Mellon, Michael T., Holt, John W., and Brothers, T. C. 2014. "SHARAD Soundings and Surface Roughness at Past, Present, and Proposed Landing Sites on Mars: Reflections at Phoenix may be Attributable to Deep Ground Ice." Journal of Geophysical Research. E. Planets, 119, (8) 1936–1949. https://doi.org/10.1002/2014JE004646.