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@article{SF_1994__49_2_135351, author = {P.M. Higgins}, title = {The {Mitsch} order on a semigroup.}, journal = {Semigroup forum}, pages = {261--266}, publisher = {mathdoc}, volume = {49}, number = {2}, year = {1994}, zbl = {0809.20052}, url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135351/} }
P.M. Higgins. The Mitsch order on a semigroup.. Semigroup forum, Tome 49 (1994) no. 2, pp. 261-266. http://geodesic.mathdoc.fr/item/SF_1994__49_2_135351/