1. UNCOPUOS, Active Debris Removal – An Essential Mechanism for Ensuring the Safety and Sustainability of Outer Space, UN Doc A/AC.105/C.1/2012/CRP.16 (2012).
2. NASA, Orbital Debris Graphics, Online: http://orbitaldebris.jsc.nasa.gov/photogallery/beehives.html, (accessed 4.12.12).
3. Hazards at GEO: the space debris population in the vicinity of the GEO belt and mitigation of its impact on commercial satellites;Skinner,2012
4. E.A. Taylor, Orbit Theory and Applications, General Electric Training Material (1991).
5. R. Choc, T. Flohrer & B. Bastida, Classification of Geosynchronous Objects, European Space Agency/European Space Operations Centre, Issue 13 2011.