@article{GDZPPN001262637, title = {On a problem of n(2)-permutable semigroups.}, journal = {Semigroup forum}, volume = {46}, year = {1993}, pages = {398-400}, zbl = {0817.20060}, url = {http://dml.mathdoc.fr/item/GDZPPN001262637} }
Nagy, A.; Babcsányi, I. On a problem of n(2)-permutable semigroups.. Semigroup forum, Tome 46 (1993) pp. 398-400. http://gdmltest.u-ga.fr/item/GDZPPN001262637/