1. On the lattice of extensions of the modal logic K. Altn;Bellisima;Arch. Math. Logic,1988
2. Modal and Classical Logic;van Benthem,1983
3. Varieties of interior algebras;Blok,1976
4. On the degree of incompleteness in modal logic and the covering relation in the lattice of modal logics;Blok,1978
5. Pretabular varieties of modal algebras;Blok;Studia Logica,1980