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WikiPedia: Vành_chia //books.google.com/books?id=f15FyZuZ3-4C&pg=PA39&d... //books.google.com/books?id=f15FyZuZ3-4C&pg=PA45&d... http://planetmath.org/?op=getobj&from=objects&id=3... http://planetmath.org/ringswhoseeverymoduleisfree //zbmath.org/?format=complete&q=an:0840.16001 //zbmath.org/?format=complete&q=an:0980.16001 http://lib.hcmup.edu.vn:8080/eFileMgr/efile_folder... https://books.google.com/books?id=f15FyZuZ3-4C&pri... https://math.stackexchange.com/q/75866 https://archive.org/details/skewfieldstheory0000co...