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WikiPedia: Triết_học_duy_vật_khoái_lạc http://www.carvaka4india.com/2011/08/materialism-i... http://www.carvaka4india.com/2011/12/charvaka-syst... http://www.carvaka4india.com/2011/12/history-of-in... http://books.google.com/books?id=hshaWu0m1D4C&pg=P... http://books.google.com/books?id=uca8R72W8iQC&pg=P... http://books.google.com/books?id=xkrCRbOq-HUC http://www.iep.utm.edu/indmat/ http://phusaonline.free.fr/TuTuong/7_TriethocAnDo.... http://www.lokayata.info/ http://www.buddhiwadi.org/ethics.htm