1. Acyclic Programs;Apt;New Generation Comput.,1991
2. Proving Termination of General Prolog Programs;Apt,1991
3. Constructive Negation Based on the Completed Database;Chan,1988
4. Predicate Logic as a Computational Formalism;Clark,1979
5. Levationis Laus;Doets;J. Logic Comput.,1993