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@article{SF_1994__48_3_135295, author = {G.U. Garba}, title = {Nilpotents in semigroups of partial one-to-one order-preserving mappings.}, journal = {Semigroup forum}, pages = {37--49}, publisher = {mathdoc}, volume = {48}, number = {3}, year = {1994}, zbl = {0796.20058}, url = {http://geodesic.mathdoc.fr/item/SF_1994__48_3_135295/} }
G.U. Garba. Nilpotents in semigroups of partial one-to-one order-preserving mappings.. Semigroup forum, Tome 48 (1994) no. 3, pp. 37-49. http://geodesic.mathdoc.fr/item/SF_1994__48_3_135295/