Solid-state six degree of freedom, motion sensor for field robotic applications. - Asad M. Madni; Deepak Bapna; Paul Levin; Eric Krotkov (IROS, 1998)

Evolution of a Prototype Lunar Rover: Addition of Laser-Based Hazard Detection, and Results from Field Trials in Lunar Analog Terrain. - Eric Krotkov; Martial Hebert; Lars Henriksen; Paul Levin; Mark W. Maimone; Reid G. Simmons; James P. Teza (Auton. Robots, 1999)