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@article{MS2_1967__20_165997, author = {G. Gr\"atzer and G.H. Wenzel}, title = {On the {Concept} of {Congruence} {Relation} in {Partial} {Algebras.}}, journal = {Mathematica Scandinavica}, pages = {275--280}, publisher = {mathdoc}, volume = {20}, year = {1967}, zbl = {0175.28801}, url = {http://geodesic.mathdoc.fr/item/MS2_1967__20_165997/} }
G. Grätzer; G.H. Wenzel. On the Concept of Congruence Relation in Partial Algebras.. Mathematica Scandinavica, Tome 20 (1967), pp. 275-280. http://geodesic.mathdoc.fr/item/MS2_1967__20_165997/