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@article{SF_1996__53_2_135486, author = {A. Umar}, title = {Semigroups of order-decreasing transformations: the isomorphism theorem.}, journal = {Semigroup forum}, pages = {220--224}, publisher = {mathdoc}, volume = {53}, number = {2}, year = {1996}, zbl = {0858.20056}, url = {http://geodesic.mathdoc.fr/item/SF_1996__53_2_135486/} }
A. Umar. Semigroups of order-decreasing transformations: the isomorphism theorem.. Semigroup forum, Tome 53 (1996) no. 2, pp. 220-224. http://geodesic.mathdoc.fr/item/SF_1996__53_2_135486/