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{{commonscat}} de WD
 
== Enllaços externs ==
{{Commonscat|Photovoltaics}}
* [http://sunmetrix.com Solar/Photovoltaic Resource] {{en}}
* [http://css.snre.umich.edu/css_doc/CSS07-08.pdf Photovoltaic Energy Factsheet] per la [[Universitat de Michigan]] {{en}} [http://www.css.snre.umich.edu/ Center for Sustainable Systems]
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