Plaut, Jeffrey J., Picardi, G., Safaeinili, Ali, Ivanov, A. B., Milkovich, S. M., Cicchetti, A., Kofman, W., Mouginot, J., Farrell, W. M., Phillips, R. J., Clifford, S. M., Frigeri, A., Orosei, R., Federico, C., Williams, I. P., Gurnett, D. A., Nielsen, E., Hagfors, T., Heggy, E., Stofan, E. R., Plettemeier, D., Watters, Thomas R., Leuschen, C. J., and Edenhofer, P. 2007. "
Subsurface radar sounding of the south polar layered deposits of Mars."
Science, 316, (5821) 92–95.
https://doi.org/10.1126/science.1139672.