1998

Andreka, H. and Givant, S. and Mikulas, Szabolcs and Nemeti, I. and Simon, A. (1998) Notions of density that imply representability in algebraic logic. Annals of Pure and Applied Logic 91 (2/3), pp. 93-190. ISSN 0168-0072.

July 2015

Mikulás, Szabolcs and Sain, I. and Simon, A. (2015) Complexity of equational theory of relational algebras with standard projection elements. Synthese 192 (7), pp. 2159-2182. ISSN 0039-7857.