1. Anon, Report of the Scientific and Technical Subcommittee of the United Nations Committee on the Peaceful Uses of Outer Space on the 44th session, held in Vienna from 12–23 February 2007, A/AC.105/890, (Annex IV), 6 March 2007.
2. Anon, Endorsement by the General Assembly: Resolution adopted by the General Assembly, A/RES/62/217, 10 January 2008.
3. Risks in space from orbiting debris;Liou;Science,2006
4. Instability of the present LEO satellite populations;Liou;Adv. Space Res.,2008
5. Collision frequency of artificial satellites: the creation of a debris belt;Kessler;JGR,1978