1. Balbiani, Ph.: 1997, ‘Axiomatization of logics based on Kripke models with relative accessibility relations’, in Orłowska, E. (ed.), Incomplete Information: Rough Set Analysis, Physica Verlag, Berlin, (forthcoming).
2. Demri, S.: 1996, private communication.
3. Demri, S.: 1996a, ‘The validity problem for logic DALLA is decidable’, Bulletin of the PAS, Mathematics 44, No. 1, pp. 79–86.
4. Demri, S.: 1996b, ‘A class of information logics with a decidable validity problem’, Proceedings of the 21st International Symposium on Mathematical Foundations of Computer Science, Krakow, Poland, September 1996, Springer Lecture Notes in Computer Science, to appear.
5. Demri, S.: 1997, ‘A completeness proof for a logic with an alternative necessity operator’, Studia Logica, to appear.