http://www.tfcbooks.com/teslafaq/q&a_045.htm
http://worldhistoryproject.org/topics/nikola-tesla
http://www.pbs.org/tesla/res/res_electime.html
http://www.teslauniverse.com/nikola-tesla-timeline-1856-birth-of-tesla
http://www.activistpost.com/2012/01/10-inventions-of-nikola-tesla-that.html
Tesla: Man Out of Time, by Margaret Cheney
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