@article{GDZPPN001252461, title = {Congruence lattices of Rees matrix semigroups.}, journal = {Semigroup forum}, volume = {14}, year = {1977}, pages = {247-262}, zbl = {0379.06005}, url = {http://dml.mathdoc.fr/item/GDZPPN001252461} }
Johnston, K. G. Congruence lattices of Rees matrix semigroups.. Semigroup forum, Tome 14 (1977) pp. 247-262. http://gdmltest.u-ga.fr/item/GDZPPN001252461/