Nickel on Mars: Constraints on meteoritic material at the surface

Albert S. Yen, D. W. Mittlefehldt, S. M. McLennan, R. Gellert, James F. Bell, Jr Y. McSween, D. W. Ming, T. J. McCoy, R. V. Morris, Matthew P. Golombek, T. Economou, M. B. Madsen, T. Wdowiak, B. C. Clark, B. L. Jolliff, C. Schröder, J. Brückner, J. Zipfel, Steven W. Squyres