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@article{SF_1993__46_1_135209, author = {G.M.S. Gomes}, title = {A characterization of the group congruences on a semigroup.}, journal = {Semigroup forum}, pages = {48--53}, publisher = {mathdoc}, volume = {46}, number = {1}, year = {1993}, zbl = {0773.20028}, url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135209/} }
G.M.S. Gomes. A characterization of the group congruences on a semigroup.. Semigroup forum, Tome 46 (1993) no. 1, pp. 48-53. http://geodesic.mathdoc.fr/item/SF_1993__46_1_135209/