1. Risks in space from orbiting debris;Liou;Science,2006
2. L.K. Newman, M. Duncan, Establishment and implementation of a close approach evaluation and avoidance process for Earth Observing System Missions, in: AAS/AIAA Astrodynamics Specialist Conference, Keystone, CO, AIAA-2006-6291.
3. NASA Office of Safety and Mission Assurance, NASA Procedural Requirement for Limiting Orbital Debris Generation, NPR 8715.6A, 2/5/08.
4. Memorandum of Agreement between the Department of Defense and the National Aeronautics and Space Administration.
5. Operating Instruction for Robotic Mission Support.