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WikiPedia: Giải thuật Euclid mở rộng http://banach.millersville.edu/~bob/math478/Extend... http://marauder.millersville.edu/~bikenaga/absalg/... http://student.mst.edu.hk/~s0210043/mulinv.cpp http://mathforum.org/library/drmath/view/51675.htm... http://homepages.inf.ed.ac.uk/s0563270/maths/javas... http://homepages.inf.ed.ac.uk/s0563270/maths/php/e... https://web.archive.org/web/20060904041824/http://... https://web.archive.org/web/20060904052226/http://... https://web.archive.org/web/20060907061342/http://... https://web.archive.org/web/20060912065201/http://...