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WikiPedia: Số_phức http://www.britannica.com/EBchecked/topic/129992 http://books.google.com/?id=g5j-cT-vg_wC http://books.google.com/books?id=g5j-cT-vg_wC&pg=P... http://books.google.de/books?id=etTbP0rItQ4C&print... http://id.loc.gov/authorities/subjects/sh85093211 http://d-nb.info/gnd/4128698-4 http://id.ndl.go.jp/auth/ndlna/00563643 https://commons.wikimedia.org/wiki/Category:Comple...