1. The pure calculus of entailment;Anderson;Journal of Symbolic Logic,1962
2. The Generalized Completeness of Horn Predicate Logic as a Programming Language;Andréka,1978
3. Logic programming and negation: a survey;Apt;Journal of Logic Programming,1994
4. Towards a Theory of Declarative Knowledge;Apt,1988
5. Contributions to the Theory of Logic Programming;Apt;Journal of the ACM,1982