1. A syntactic connection between proof procedures and refutation procedures;Bibel,1977
2. Proof search in a Gentzen-like system of first-order logic;Bibel,1975
3. Non-resolution theorem proving;Bledsoe,1975
4. Computer proofs of limit theorems;Bledsoe;Artif. Intelligence,1972
5. The complexity of theorem proving procedures;Cook;Proc. 3rd Ann. ACM Symp. on Theory of Computing,1971