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@article{SF_1977__15_134249, author = {B. Bir\'o and E.W. Kiss and P.P. Palfy}, title = {On the congruence extension property.}, journal = {Semigroup forum}, pages = {183--184}, publisher = {mathdoc}, volume = {15}, year = {1977}, zbl = {0384.08003}, url = {http://geodesic.mathdoc.fr/item/SF_1977__15_134249/} }
B. Biró; E.W. Kiss; P.P. Palfy. On the congruence extension property.. Semigroup forum, Tome 15 (1977), pp. 183-184. http://geodesic.mathdoc.fr/item/SF_1977__15_134249/