1. Adámek, J., Herrlich, H., Strecker, G.: Abstract and concrete categories. John Wiley and Sons (1990)
2. Andréka, H.: Atomic representable relation and cylindric algebras with nonrepresentable completions. Mathematical Institute of the Hungarian Academy of Sciences, Budapest, manuscript (1997)
3. Andréka H.: Complexity of equations valid in algebras of relations, Parts I-II. Annals of Pure and Applied Logic 89, 149–229 (1997)
4. Andréka, H., Comer, S.D., Németi, I.: Epimorphisms of cylindric algebras. Mathematical Institute of the Hungarian Academy of Sciences, Budapest (1982)
5. Andréka, H., Comer, S.D., Németi, I.: Surjectiveness of cylindric algebras. Abstracts of Amer. Math. Soc. 4,3 293, *83T-08-186 (1983)