@article{01332358,
title = {Congruence classes in regular varieties.},
journal = {Acta Mathematica Universitatis Comenianae. New Series},
volume = {68},
year = {1999},
pages = {71-75},
zbl = {1014.08002},
language = {en},
url = {http://dml.mathdoc.fr/item/01332358}
}
Bělohlávek, R.; Chajda, I. Congruence classes in regular varieties.. Acta Mathematica Universitatis Comenianae. New Series, Tome 68 (1999) pp. 71-75. http://gdmltest.u-ga.fr/item/01332358/