1. B. Beckert, S. Gerberding, R. Hähnle, and W. Kernig. The tableau-based theorem prover 3TAP for multiple-valued logics. In Proceedings, CADE 11, Albany/NY, LNCS. Springer, 1992.
2. B. Beckert and R. Hähnle. An improved method for adding equality to free variable semantic tableaux. In Proceedings, CADE 11, Albany/NY, LNCS. Springer, 1992.
3. B. Beckert, R. Hähnle, and P. H. Schmitt. The even more liberalized δ-rule in free variable semantic tableaux. In Proceedings, 3rd Kurt Gödel Colloquium, Brno, Czech Republic, LNCS. Springer, 1993.
4. B. Beckert and J. Posegga. leanTAP: Lean tableau-based theorem proving. To appear (available upon request from the authors), 1994.
5. E. Eder. Relative Complexities of First-Order Calculi. Artificial Intelligence. Vieweg Verlag, 1992.