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Sources:
http://www.scientificamerican.com/article/fact-or-fiction-nasa-spen/
http://www.smithsonianmag.com/arts-culture/the-fisher-space-pen-boldly-writes-where-no-man-has-written-before-1020748/?no-ist=
https://www.google.com/patents/US3285228
http://www.thespacereview.com/archive/613d.pdf http://www.audiologyonline.com/interviews/interview-with-paul-fisher-inventor-1635 http://scifun.chem.wisc.edu/homeexpts/lumpyliquids.htm
http://www.thespacereview.com/archive/613d.pdf
http://history.nasa.gov/SP-4029/Apollo_07a_Summary.htm
Aldrin, Buzz. With Abraham, Ken. Magnificent Desolation: The Long Journey Home from the Moon. New York: Harmony Books, 2009. pp. 45-46.