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@article{SF_1970__1_133801, author = {A.H. Clifford}, title = {A proof of the {Montague-Plemmons-Schein} {Theorem} on maximal subgroups of the semigroup of binary relations.}, journal = {Semigroup forum}, pages = {272--275}, publisher = {mathdoc}, volume = {1}, year = {1970}, zbl = {0211.03902}, url = {http://geodesic.mathdoc.fr/item/SF_1970__1_133801/} }
A.H. Clifford. A proof of the Montague-Plemmons-Schein Theorem on maximal subgroups of the semigroup of binary relations.. Semigroup forum, Tome 1 (1970), pp. 272-275. http://geodesic.mathdoc.fr/item/SF_1970__1_133801/