On the relationship of AP, RS and CEP in congruence modular varieties. II
Clifford Bergman, Ralph McKenzie · Proceedings of the American Mathematical Society · 1988
Let V V be a congruence distributive variety, or a congruence modular variety whose free algebra on 2 generators is finite. If V V is residually small and has the amalgamation property, then it has the congruence extension property. Several applications are presented.