1. The complexity of finite functions;Boppana,1990
2. The undecidability of k-provability;Buss;Ann. Pure Appl. Logic,1991
3. On logical flow graphs;Carbone,1993
4. The Craig interpolation theorem for schematic systems;Carbone,1996
5. The relative efficiency of propositional proof systems;Cook;J. Symbolic Logic,1979