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@article{SF_1992__45_3_135196, author = {M. Petrich}, title = {The semigroup generated by certain operators on the congruence lattice of a {Clifford} semigroup.}, journal = {Semigroup forum}, pages = {332--341}, publisher = {mathdoc}, volume = {45}, number = {3}, year = {1992}, zbl = {0766.20021}, url = {http://geodesic.mathdoc.fr/item/SF_1992__45_3_135196/} }
M. Petrich. The semigroup generated by certain operators on the congruence lattice of a Clifford semigroup.. Semigroup forum, Tome 45 (1992) no. 3, pp. 332-341. http://geodesic.mathdoc.fr/item/SF_1992__45_3_135196/