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@article{SF_1980__19_134392, author = {Y. Kobayashi}, title = {The exponent semigroup of a semigroup satisfying {(XY)3} = x3 {Y3.}}, journal = {Semigroup forum}, pages = {323--330}, publisher = {mathdoc}, volume = {19}, year = {1980}, zbl = {0433.20041}, url = {http://geodesic.mathdoc.fr/item/SF_1980__19_134392/} }
Y. Kobayashi. The exponent semigroup of a semigroup satisfying (XY)3 = x3 Y3.. Semigroup forum, Tome 19 (1980), pp. 323-330. http://geodesic.mathdoc.fr/item/SF_1980__19_134392/