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Sources

• HybridCars.com. "Toyota Prius Photo-Voltaic Roof: Solar-Powered PR?" July 30, 2008. (May 4, 2009)http://www.hybridcars.com/components/toyota-prius-photo-voltaic-roof-solar-powered-pr-0730.html
• Reuters.com. "Toyota to add solar panels to some Prius hybrids." July 7, 2008. (May 4, 2009) http://www.reuters.com/article/technologyNews/idUST29871820080707
• Woodyard, Chris. "Automakers install solar panels on such cars as Prius, Audi A8." USA Today. Jan. 20, 2009. (May 4, 2009) http://www.usatoday.com/tech/news/2009-01-19-solar-panel-cars-automakers-prius_N.htm