1. H. Andréka. Complexity of the Equations Valid in Algebras of Relations, Thesis for DSc, Hungarian Academy of Sciences, 1991.
2. H. Andréka, S. Givant, Sz. Mikulds, I. Németi. Rectangular Density Implies Representability, Mathematical Institute of the Hungarian Academy of Sciences, 1993.
3. H. Andréka, J. D. Monk, I. Németi, (eds.). Algebraic Logic. North-Holland, Amsterdam, 1991.
4. H. Andréka, I. Németi, I. Sain. Methodology of Applying Algebraic Logic to “Plain” Logic, Mathematical Institute of the Hungarian Academy of Sciences, 1993.
5. S. Bums, H. P. Sankappanavar. A Course in Universal Algebra. Springer-Verlag, Berlin, 1981.