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@article{SF_1976__13_134200, author = {B.M. Schein}, title = {Regular elements of the semigroup of all binary relations.}, journal = {Semigroup forum}, pages = {95--102}, publisher = {mathdoc}, volume = {13}, year = {1976}, zbl = {0355.20058}, url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134200/} }
B.M. Schein. Regular elements of the semigroup of all binary relations.. Semigroup forum, Tome 13 (1976), pp. 95-102. http://geodesic.mathdoc.fr/item/SF_1976__13_134200/