Spencer Cooley

The Mars Hopper: Development, Simulation and Experimental Validation of a Radioisotope Exploration Probe for the Martian Surface

James E. O'Brien, Robert C. O'Brien, Steven D. Howe, 2012 .

The Mars Hopper: a radioisotope powered, impulse driven, long-range, long-lived mobile platform for exploration of Mars

James E. Werner, Andrew C. Klein, Robert C. O'Brien, 2011 .