1. Towards a Theory of Declarative Knowledge;Apt,1988
2. Efficient Bottom-Up Computation of Queries on Stratified Databases;Balbin;Journal of Logic Programming,1988
3. Query Evaluation in Recursive Databases: Bottom-Up and Top-Down Reconciled;Bry,1990
4. Bottom-Up Evaluation of Hierarchical Disjunctive Deductive, Databases;Fernández,1991
5. The Alternating Fixpoint of Logic Programs with Negation;Van Gelder,1989