References
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http://thermal.sdsu.edu/profs/Bhattacharjee/sooby/classes/s99/me696s99/rockets/fundamen.html
http://www.hughespace.com/factsheets/xips/xips.html
http://www.engin.umich.edu/dept/aero/spacelab/thrusters/thrusters.html
http://www.stanford.edu/group/pdl/EP/EP.html