HAVIAR, Miroslav. Grätzer, G.; Schmidt, E. T.: Congruence lattices of p-algebras. In MathSciNet : Mathematical Reviews on the web. 1. vyd. - Providence : American Mathematical Society, 1996. ISSN 2167-5163, 96c:06011, online, mR1331913, pp. [1-2]. Recenzia na: Congruence lattices of p-algebras / G. Grätzer, E. T. Schmidt. - Cham : Springer International Publishing, 1995.