| Sources
http://www.scribd.com/doc/514466/Cryogenic-Aircraft
http://www.skyspark.eu/web/eng/index.php
http://en.wikipedia.org/wiki/Tupolev_Tu-155
http://www.flightglobal.com/blogs/flight-international/2008/04/tupolevs-cryogenic-tupolev-tu1.html
http://flyintelligence.com/index.php?option=com_content&view=article&id=365:un-avion-electrique-qui-carbure-a-lhydrogene&catid=39:articles&Itemid=55
"ZZ Manu"
http://accrodavion.be/Accrodavions/index.html
http://www.solarimpulse.com/sitv/pictures.php?lang=en
"comment vol tu ?"
http://jroger.nuxit.net/berliweb/homepage/homepage.htm
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