1. M. Abadi, Z. Manna, Temporal Logic Programming, Proc. IEEE Symposium on Logic Programming, San Francisco, 1987.
2. Y. Auffray, P. Enjalbert, Modal theorem proving using equational methods, Proc. 11th Int. Joint Conf. on Artif. Intell., Detroit, 1989.
3. L. Catach, Normal Multimodal Logics, Proc. Nat. Conf. on Artif. Intel.'88, St Paul, Minesota, 1988.
4. F.Debart, M. Lescot, Extension de la logique des chemins à la logique multi-modale: théorie et implémentation, Technical Report "Les cahiers du LIUC" 90-4, 1990.
5. F.Debart, P. Enjalbert, M. Lescot, Multi-Modal Automated Deduction Using Equational And Order-Sorted Logic, Proc. 2nd Conf. on Conditional and Typed Rewriting Systems, Montreal, To appear in Springer LNCS, M.Okada & S.Kaplan Ed., 1990.