1. and , Model Theory. North-Holland Publ. Comp., Amsterdam 1973.
2. On the decidability of propositional algorithmic logic. This Zeitschr. (to appear).
3. Propositional dynamic logic of regular programs
4. , and , Computability and completeness in logics of programs: preliminary report. In: 9. ACM Symposium on Theory of Computing 1977, pp. 261–268.
5. Model Theory for Infinitary Logic. North-Holland Publ. Comp., Amsterdam 1971.