@article{GDZPPN00126205X, title = {Subdirectly irreducible completely symmetrical semigroups.}, journal = {Semigroup forum}, volume = {44}, year = {1992}, pages = {267-271}, zbl = {0808.20048}, url = {http://dml.mathdoc.fr/item/GDZPPN00126205X} }
Nagy, A. Subdirectly irreducible completely symmetrical semigroups.. Semigroup forum, Tome 44 (1992) pp. 267-271. http://gdmltest.u-ga.fr/item/GDZPPN00126205X/