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@article{SF_1986__34_134850, author = {N. Kehayopulu}, title = {On weakly commutative poe-semigroups.}, journal = {Semigroup forum}, pages = {367--370}, publisher = {mathdoc}, volume = {34}, year = {1986}, zbl = {0613.06009}, url = {http://geodesic.mathdoc.fr/item/SF_1986__34_134850/} }
N. Kehayopulu. On weakly commutative poe-semigroups.. Semigroup forum, Tome 34 (1986), pp. 367-370. http://geodesic.mathdoc.fr/item/SF_1986__34_134850/