1. 3Committee on Space Shuttle Meteoroid/Debris Risk Management, Protecting the Space Shuttle From Meteoroids and Orbital Debris,National Academies Press, 1997, pp.36.
2. 8Vallado, D.A., Fundamentals of Astrodynamics and Applications, 3rded.Springer-Microcosm Press, New York, 2007, pp.838.