1. Federal Aviation Administration. Air Traffic by the Numbers (FAA, 2018).
2. Inter-Agency Space Debris Coordination Committee. Stability of the Future LEO Environment IADC-12-08, Rev. 1, January 2013 (IADC, 2013).
3. McLeary, P. ‘Space Mystery: Are Russian Doll Sats a Threat?’ Breaking Defense (16 August 2018).
4. Gleason, M. P. & Cottom, T. U.S. Space Traffic Management: Best Practices, Guidelines, Standards and International Considerations (The Aerospace Corporation, 2018).
5. Inter-Agency Space Debris Coordination Committee. IADC Space Debris Mitigation Guidelines IADC-02-01, Revision 1, September 2007 (IADC, 2007).