Ming, D. W., Mittlefehldt, D. W., Morris, R. V., Golden, D. C., Gellert, R., Yen, A., Clark, B. C., Squyres, S. W., Farrand, W. H., Ruff, S. W., Arvidson, R. E., Klingelhöfer, G., McSween, H. Y., Rodionov, D. S., Schroder, C., de Souza, P. A., & Wang, A. (2006). Geochemical and mineralogical indicators for aqueous processes in the Columbia Hills of Gusev crater, Mars. Journal of Geophysical Research-Planets, 111(E2):. doi:10.1029/2005JE002560.