Spectrophotometric properties of materials observed by Pancam on the Mars Exploration Rovers: 1. Spirit

Jeffrey R. Johnson, William M. Grundy, Mark T. Lemmon, James F. Bell, Miles J. Johnson, Robert G. Deen, Raymond E. Arvidson, William H. Farrand, Edward A. Guinness, Alexander G. Hayes, Ken E. Herkenhoff, Frank Seelos IV, Jason Soderblom, Steve Squyres