1. Andréka, H., 1988, ?On the representation problem of distributive semilattice-ordered semigroups?, Mathematical Institute of the Hungarian Academy of Sciences.
2. Andréka, H., 1991, ?Representations of distributive lattice-ordered semigroups with binary relations?,Algebra Universalis 28, 12?25.
3. Andréka, H., Németi, I., Sain, I., 1991, ?On the strength of temporal proofs?,Theoretical Computer Science 80, 125?151.
4. van Benthem, J., 1989a, ?Semantic parallels in natural language and computation? inLogic Colloquium. Granada 1987, Ebbinghaus, H.-D.et al., (eds.), North-Holland, Amsterdam, 331?375.
5. van Benthem, J., 1989b, ?Language in action?,Journal of Philosophical Logic 20, 225?263.