References
--. "The Voyager Neptune Planetary Guide." JPL Publ. 89-24.
Borwein, J. and Bailey, D. Mathematics by Experiment: Plausible Reasoning in the 21st Century. Natick, MA: A. K. Peters, pp. 37-38, 2003.
Johnson, B. "The Slingshot Effect, Alias 'Gravity Assist': How Spacecraft Accelerate in Planetary Flybys." http://www.dur.ac.uk/bob.johnson/SL/.
