1. Symbolical Logic and Mechanical Theorem Proving;Chang,1973
2. The complexity of theorem proving procedures;Cook;Proceedings of the 3rd ACM Symposium on Theory of Computing,1971
3. Resolution Modal Logic. Automated Reasoning in Non-classical Logic;Fariñas del Cerro;Logique et Analyse,1985
4. Molog: A System That Extends Prolog with Modal Logic;Fariñas del Cerro;New Generation Computing,1986