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;
Shaw, A., Arvidson, R. E., Bonitz, R., Carsten, J., Keller, H. U., Lemmon, M. T., et al. (2009). Phoenix Soil Physical Properties Investigation. Journal Geophysical Research, 114: E00E05. doi:10.1029/2009JE003455.