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WikiPedia: Nút_dẹt http://www.animatedknots.com/reef/ http://www.fieggen.com/shoelace/reefknot.htm http://www.igkt.net/beginners/sea-cadet-knots.html http://www.42brghtn.mistral.co.uk/knots/42ktreef.h... https://web.archive.org/web/20020816021153/http://... https://web.archive.org/web/20021019072537/http://... https://web.archive.org/web/20070922045919/http://... https://web.archive.org/web/20080708185325/http://... https://commons.wikimedia.org/wiki/Category:Square...