Keller, H. U. Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society; MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Mellon, M. T., Malin, M. C., Arvidson, R. E., Searls, M. L., Sizemore, H. G., Heet, T. L., et al. (2009). The Periglacial Landscape at the Phoenix Landing Site. Journal Geophysical Research, 114: E00E06. doi:10.1029/2009JE003418.