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@article{SF_1994__48_3_135298, author = {A. Nagy}, title = {Permutation functions and (n,m)-commutativity of semigroups .}, journal = {Semigroup forum}, pages = {71--78}, publisher = {mathdoc}, volume = {48}, number = {3}, year = {1994}, zbl = {0805.20051}, url = {http://geodesic.mathdoc.fr/item/SF_1994__48_3_135298/} }
A. Nagy. Permutation functions and (n,m)-commutativity of semigroups .. Semigroup forum, Tome 48 (1994) no. 3, pp. 71-78. http://geodesic.mathdoc.fr/item/SF_1994__48_3_135298/