1. Helical Drag Bit — A Self-Advancing Energy Efficient Drill Bit-Phase I Feasibility Study;Amini,1998
2. Guidelines for advancing mars drilling prototypes to TRL-4;Beaty,2001
3. The Low Reaction Force Drill;Hill;Final Report, NASA SBIR, Contr. NAS5-00100,2000
4. The Low Reaction Force Drill — A Recommendation For Drilling on Mars;Hill,2001
5. The LRFD Bit System Study;Hill,2001