1. The use of theorem-proving techniques in question-answering systems;Green,1968
2. Experiments with a deductive question-answering program;Slagle;Comm. ACM,1965
3. PROW: a step toward automatic program-writing;Waldinger,1969
4. Theorem-proving by resolution as a basis for question-answering systems;Green,1969
5. Thirty years of foundational studies;Mostowski;Acta Philosophica Fennica,1964