Arvidson, R. E., Squyres, S. W., Anderson, R. C., Bell, J. F., Blaney, D., Brückner, J., et al. (2006). Overview of the Spirit Mars Exploration Rover Mission to Gusev Crater: Landing site to Backstay Rock in the Columbia Hills. Journal Geophysical Research, 111(E2): E02S01. doi:10.1029/2005JE002499.