@article{01069376, title = {Axioms for invariant factors.}, journal = {Portugaliae Mathematica. Nova S\'erie}, volume = {54}, year = {1997}, pages = {263-269}, zbl = {0887.15003}, language = {en}, url = {http://dml.mathdoc.fr/item/01069376} }
Queiró, João Filipe. Axioms for invariant factors.. Portugaliae Mathematica. Nova Série, Tome 54 (1997) pp. 263-269. http://gdmltest.u-ga.fr/item/01069376/