@article{GDZPPN001253883, title = {The exponent semigroup of a semigroup satisfying (XY)3 = x3 Y3.}, journal = {Semigroup forum}, volume = {20}, year = {1980}, pages = {323-330}, zbl = {0433.20041}, url = {http://dml.mathdoc.fr/item/GDZPPN001253883} }
Kobayashi, Y. The exponent semigroup of a semigroup satisfying (XY)3 = x3 Y3.. Semigroup forum, Tome 20 (1980) pp. 323-330. http://gdmltest.u-ga.fr/item/GDZPPN001253883/