Head, J. W.; Marchant, D. R.; Dickson, J. L.; Kress, A. M.; Baker, D. M., Northern mid-latitude glaciation in the Late Amazonian period of Mars: Criteria for the recognition of debris-covered glacier and valley glacier landsystem deposits, Earth snd Planetary Science Letters, June 26, 2009, doi:10.1016/j.epsl.2009.06.041
