1. Symbolic Logic and Mechanical Theorem-Proving;Chang,1973
2. The Complexity of Theorem-proving Procedures;Cook,1971
3. HORNLOG: A First-Order Theorem Prover for Negations of Horn Clauses based on Graph-Rewriting;Gallier,1984
4. Introduction to Formal Language Theory;Harrison,1978
5. Unit Refutations and Horn Sets;Henschen;J. ACM,1974