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@article{SF_1972__5_133927, author = {G. Markowsky}, title = {Idempotents and product representations with applications to the semigroup of binary relations.}, journal = {Semigroup forum}, pages = {95--119}, publisher = {mathdoc}, volume = {5}, year = {1972}, zbl = {0264.20047}, url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133927/} }
G. Markowsky. Idempotents and product representations with applications to the semigroup of binary relations.. Semigroup forum, Tome 5 (1972), pp. 95-119. http://geodesic.mathdoc.fr/item/SF_1972__5_133927/