%0 Journal Article %A G. Grätzer %A G.H. Wenzel %T On the Concept of Congruence Relation in Partial Algebras. %J Mathematica Scandinavica %D 1967 %P 275-280 %V 20 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1967__20_165997/ %F MS2_1967__20_165997