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2. Dualities between Alternative Semantics for Logic Programming and Nonmonotonic Reasoning;Baral,1991
3. A Useful Four-Valued Logic;Belnap,1977
4. Intuitive Semantics for First-Degree Entailments and Coupled Trees;Dunn;Philos. Stud.,1976
5. Relevance Logic and Entailment;Dunn,1986