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@article{SF_1987__36_134902, author = {J. Ahsan}, title = {Monoids characterized by their quasi-injective {S-systems.}}, journal = {Semigroup forum}, pages = {285--292}, publisher = {mathdoc}, volume = {36}, year = {1987}, zbl = {0625.20057}, url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134902/} }
J. Ahsan. Monoids characterized by their quasi-injective S-systems.. Semigroup forum, Tome 36 (1987), pp. 285-292. http://geodesic.mathdoc.fr/item/SF_1987__36_134902/