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== Enllaços externs ==
* [https://web.archive.org/web/20080926103027/http://www2.ciemat.es/actividad/programas/p_er_sistconcsolar.html Sistemas de concentración solar]
* [http://www.ecoaction.gc.ca/ECOENERGY-ECOENERGIE/heat-chauffage/v2008/collectors-capteurs-eng.cfm Canadian government ratings of solar collectors]
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