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@article{SF_1972__5_133953, author = {J.A. Gerhard}, title = {Some subdirectly irreducible idem-potent semigroups.}, journal = {Semigroup forum}, pages = {362--369}, publisher = {mathdoc}, volume = {5}, year = {1972}, language = {en}, url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133953/} }
J.A. Gerhard. Some subdirectly irreducible idem-potent semigroups.. Semigroup forum, Tome 5 (1972), pp. 362-369. http://geodesic.mathdoc.fr/item/SF_1972__5_133953/