@article{SF_1992__45_3_135181,
     author = {A. Nagy},
     title = {On the structure of (m,n)-commutative   semigroups.},
     journal = {Semigroup forum},
     pages = {183--190},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {1992},
     zbl = {0789.20070},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__45_3_135181/}
}