1. IADC Space Debris Mitigation Guidelines, IADC Document no. IADC-02-01, 15 October 2002, Revision 1 September 2007.
2. N.L. Johnson, Medium earth orbits: is there a need for a third protected region?, Paper no. IAC-10-A6.4.1, Presented at the 61st International Astronautical Congress, Prague, Czech Republic, 27 September–1 October 2010.
3. Mid-term review of the European satellite radio navigation programmes, European Comission Document no. COM(2011) 5/3, 18 January 2011.
4. Drag sail for end-of-life disposal from low earth orbit;Roberts;J. Spacecr. Rockets,2007
5. D.C. Maessen, E.D.V. Breukelen, B.T.C. Zandbergen, O.K. Bergsma, Development of a generic inflatable de-orbit device for CubeSats, Paper no. IAC-07-A6.3.6, Presented at the 58th International Astronautical Congress, Hyderabad, India, 24–28 September 2007.