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@article{SF_1987__36_134900, author = {S.K. Stein}, title = {Semigroups satisfying xy = yg (x,y)x.}, journal = {Semigroup forum}, pages = {249--252}, publisher = {mathdoc}, volume = {36}, year = {1987}, zbl = {0619.20039}, url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134900/} }
S.K. Stein. Semigroups satisfying xy = yg (x,y)x.. Semigroup forum, Tome 36 (1987), pp. 249-252. http://geodesic.mathdoc.fr/item/SF_1987__36_134900/