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Linje 81:
* [http://www.spacedaily.com Spacedaily.com]
*[http://www.iol.co.za/index.php?click_id=31&art_id=iol1055339117995S162&set_id=1 IOL, Popular Mechanics, June 11 2003: Super spaceships not far out]
*[http://web.archive.org/web/20000816001816/http://www.space.com/businesstechnology/technology/cold_plasma_000724.html Space.com: Force Fields and 'Plasma' Shields Get Closer to Reality]
{{Dagens artikel|dato=21. juli 2005}}
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