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@article{SF_1991__43_3_135114, author = {P.V. Ramana Murty and S. Hanumantha Rao}, title = {On a problem in poe-semigroups.}, journal = {Semigroup forum}, pages = {260--262}, publisher = {mathdoc}, volume = {43}, number = {3}, year = {1991}, zbl = {0732.06008}, url = {http://geodesic.mathdoc.fr/item/SF_1991__43_3_135114/} }
P.V. Ramana Murty; S. Hanumantha Rao. On a problem in poe-semigroups.. Semigroup forum, Tome 43 (1991) no. 3, pp. 260-262. http://geodesic.mathdoc.fr/item/SF_1991__43_3_135114/