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@article{SF_1976__12_134173, author = {A. B. Engel}, title = {Necessary conditions for a semigroup to be an integral {CRM-ring} with identity.}, journal = {Semigroup forum}, pages = {207--214}, publisher = {mathdoc}, volume = {12}, year = {1976}, zbl = {0328.20061}, url = {http://geodesic.mathdoc.fr/item/SF_1976__12_134173/} }
A. B. Engel. Necessary conditions for a semigroup to be an integral CRM-ring with identity.. Semigroup forum, Tome 12 (1976), pp. 207-214. http://geodesic.mathdoc.fr/item/SF_1976__12_134173/