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@article{SF_1976__13_134219, author = {T.S. Blyth}, title = {On middle units in orthodox semigroups.}, journal = {Semigroup forum}, pages = {261--266}, publisher = {mathdoc}, volume = {13}, year = {1976}, zbl = {0353.20057}, url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134219/} }
T.S. Blyth. On middle units in orthodox semigroups.. Semigroup forum, Tome 13 (1976), pp. 261-266. http://geodesic.mathdoc.fr/item/SF_1976__13_134219/