@article{03925787, title = {The largest proper congruence on S(X).}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {7}, year = {1984}, pages = {663-666}, doi = {10.1155/S0161171284000697}, zbl = {0578.54025}, language = {en}, url = {http://dml.mathdoc.fr/item/03925787} }
Magill, K.D.jun. The largest proper congruence on S(X).. International Journal of Mathematics and Mathematical Sciences, Tome 7 (1984) pp. 663-666. doi : 10.1155/S0161171284000697. http://gdmltest.u-ga.fr/item/03925787/