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WikiPedia: Thu_mua http://ardentpartners.com/research/index.php?main_... http://www.buyinglegal.com/ http://archive.wikiwix.com/cache/20110928041946/ht... http://ecommons.txstate.edu/arp/338 http://europa.eu/youreurope/business/profiting-fro... http://ec.europa.eu/environment/gpp/glossary_en.ht... http://ec.europa.eu/environment/gpp/gpp_criteria_e... http://ec.europa.eu/environment/gpp/index_en.htm http://mandate376.standards.eu/standard http://www.who.int/disabilities/world_report/2011/...