1. Equational axioms for classes of Heyting algebras;Baker;Alg. Univ,1976
2. Distributive lattices;Balbes,1974
3. Le radical de Stone d'une p-algebre;Bordalo;Bulletin de la Société Royale des Sciences de Liége, 48e année,1979
4. A course in Universal Algebra;Burris,1981
5. Normal lattices;Cornish;J. Austral. Math. Soc,1972