@article{GDZPPN001262114,
title = {The semigroup generated by certain operators on the congruence lattice of a Clifford semigroup.},
journal = {Semigroup forum},
volume = {44},
year = {1992},
pages = {332-341},
zbl = {0766.20021},
url = {http://dml.mathdoc.fr/item/GDZPPN001262114}
}
Petrich, M. The semigroup generated by certain operators on the congruence lattice of a Clifford semigroup.. Semigroup forum, Tome 44 (1992) pp. 332-341. http://gdmltest.u-ga.fr/item/GDZPPN001262114/