1. On set-theoretic characterization of congruence lattices;Armbrust;This Zeitschrift,1970
2. Armbrust , M. Direct limits of congruence systems
3. Some remarks on projective model classes and the interpolation theorem;Armbrust;Math. Ann.,1972
4. Grätzer , G. 1968
5. Correspondence lattices of universal algebras;Iskander;Izv. Akad. Nauk SSSR, Ser. Mat.,1965