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@article{SF_1993__46_1_135246, author = {A. Nagy and I. Babcs\'anyi}, title = {On a problem of n(2)-permutable semigroups.}, journal = {Semigroup forum}, pages = {398--400}, publisher = {mathdoc}, volume = {46}, number = {1}, year = {1993}, zbl = {0817.20060}, url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135246/} }
A. Nagy; I. Babcsányi. On a problem of n(2)-permutable semigroups.. Semigroup forum, Tome 46 (1993) no. 1, pp. 398-400. http://geodesic.mathdoc.fr/item/SF_1993__46_1_135246/