From the January 20, 2006, issue of Science:
Formation of Glaciers on Mars by Atmospheric Precipitation at High Obliquity
F. Forget, R. M. Haberle, F. Montmessin, B. Levrard, and J. W. Head
Science 311, 368-371 (2006)
http://www.sciencemag.org/cgi/content/abstract/311/5759/368
http://www.sciencemag.org/cgi/content/full/311/5759/368/DC1
Note: The online embargo warning may pop up until the links go active in a short while. However, the official embargo has been lifted as witnessed by the press releases below.
See also:
http://www.brown.edu/Administration/News_Bureau/2005-06/05-065.html
http://www.space.com/scienceastronomy/060119_mars_snow.html
Another related paper was just published in the January 31, 2006, issue of Earth and Planetary Science Letters:
Extensive valley glacier deposits in the northern mid-latitudes of Mars: Evidence for Late Amazonian obliquity-driven climate change
J.W. Head, D.R. Marchant, M.C. Agnew, C.I. Fassett and M.A. Kreslavsky
Earth Planet. Sci. Lett. 241, 663-671 (2006)
http://dx.doi.org/10.1016/j.epsl.2005.11.016
A http://www.planetary.brown.edu/pdfs/3129ip.pdf is available from the Brown University Planetary Geosciences Group website.
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