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WikiPedia: Ngón_áp_út http://www.unifr.ch/ifaa/Public/EntryPage/TA98%20T... http://xiphoid.biostr.washington.edu/fma/fmabrowse... https://web.archive.org/web/20080123085956/http://... https://commons.wikimedia.org/wiki/Category:Ring_f... https://books.google.com.vn/books?id=EO0K6F5xDv0C&...