1. Free algebras in discriminator varieties;Andréka;Algebra Universalis,1991
2. Finite monadic algebras;Bass;Proc. Amer. Math. Soc.,1958
3. Structural completeness in algebra and logic;Bergman,1991
4. Varieties of interior algebras;Blok,1976
5. Equational classes of closure algebras. I;Blok;Nederl. Akad. Wetensch. Proc. Ser. A, Indag. Math.,1975