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¹¹http://www.wharton.upenn.edu/125anniversaryissue/musk.html
¹²http://www.theregister.co.uk/2012/12/05/stratolaunch_orbital_deal
¹³http://www.success.com/articles/426-from-the-corner-office-elon-musk
¹⁴http://www.raymears.com/blog/an-interview-with-ray-mears-on-the-
arctic/3430
¹⁵http://elonenthusiast.com/post/46886290521/mission-impossible
¹⁶http://www.delawareonline.com/article/20130422/BUSINESS09/
304220043/Elon-Musk-doesn-t-let-up-Tesla-SpaceX?nclick_check=1
¹⁷http://chargedevs.com/features/qa-with-ian-wright-the-ceo-of-
wrightspeed-on-tesla-gas-turbines-and-electric-trucks/
¹⁸https://www.youtube.com/watch?v=oJkiRZ-bAlo