* Most information is from lecture notes
Durgin, G., Lectures in Satellite Communications: ECE6390, Georgia Institute of Technology, Atlanta, Georgia, FALL 2004.
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NASA/SP-8103, Palluconi, F. D., The planets Uranus, Neptune, and Pluto (1971), NASA SPACE VEHICLE DESIGN CRITERIA (Environment), NASA Goddard Space Flight Center (Greenbelt, MD, United States), November,1972, pp. 99
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Woodruff, John, ed.,Firefly Astronomy Dictionary, Firefly Books Ltd., 2003
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Allnuty, J., Bostian, C., Pratt, T., satellite Communications s.e., John Wiley & Sons, Inc., 2003
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