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@article{SF_1975__10_134096, author = {T.E. Hays}, title = {Irreducible semigroups are monotone.}, journal = {Semigroup forum}, pages = {25--31}, publisher = {mathdoc}, volume = {10}, year = {1975}, zbl = {0298.22002}, url = {http://geodesic.mathdoc.fr/item/SF_1975__10_134096/} }
T.E. Hays. Irreducible semigroups are monotone.. Semigroup forum, Tome 10 (1975), pp. 25-31. http://geodesic.mathdoc.fr/item/SF_1975__10_134096/