Journal or Book Title
Proceedings of the American Mathematical Society
Let V be a congruence distributive variety, or a congruence modular variety whose free algebra on 2 generators is finite. If V is residually small and has the amalgamation property, then it has the congruence extension property. Several applications are presented.
American Mathematical Society
Bergman, Clifford and McKenzie, Ralph, "On the Relationship of AP, RS, and CEP in Congruence Modular Varieties, II" (1988). Mathematics Publications. 2.