%0 Journal Article %A Chajda, Ivan %T Varieties having the congruence extension property %J Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica %D 1995 %P 63-68 %V 34 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/AUPO_1995__34_1_a6/ %G en %F AUPO_1995__34_1_a6