@article{GDZPPN002348934, title = {On the Concept of Congruence Relation in Partial Algebras.}, journal = {Mathematica Scandinavica}, volume = {20}, year = {1967}, pages = {275-280}, zbl = {0175.28801}, url = {http://dml.mathdoc.fr/item/GDZPPN002348934} }
Grätzer, G.; Wenzel, G.H. On the Concept of Congruence Relation in Partial Algebras.. Mathematica Scandinavica, Tome 20 (1967) pp. 275-280. http://gdmltest.u-ga.fr/item/GDZPPN002348934/