@article{GDZPPN001259784, title = {Foliations induced by congruences.}, journal = {Semigroup forum}, volume = {38}, year = {1989}, pages = {365-370}, zbl = {0663.22001}, url = {http://dml.mathdoc.fr/item/GDZPPN001259784} }
Hofmann, K.H.; Ruppert, W.A.F. Foliations induced by congruences.. Semigroup forum, Tome 38 (1989) pp. 365-370. http://gdmltest.u-ga.fr/item/GDZPPN001259784/