@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/