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@article{SF_1984__30_134729, author = {D.T. Huynh}, title = {Properties of congruences on commutative monoids.}, journal = {Semigroup forum}, pages = {351--364}, publisher = {mathdoc}, volume = {30}, year = {1984}, zbl = {0548.20047}, url = {http://geodesic.mathdoc.fr/item/SF_1984__30_134729/} }
D.T. Huynh. Properties of congruences on commutative monoids.. Semigroup forum, Tome 30 (1984), pp. 351-364. http://geodesic.mathdoc.fr/item/SF_1984__30_134729/