Bacon, S. N., McDonald, E. V., Baker, S. E., Caldwell, T. G., Stullenbarger, G. (2008). Desert terrain characterization of landforms and surface materials within vehicle test courses at US Army Yuma Proving Ground, USA, Journal of Terramechanics, 45 (5), 167-183, 10.1016/j.jterra.2008.09.005