1. Minimal non-two-colorable hypergraphs and minimal unsatisfiable formulas;Aharoni;J. Combin. Theor.,1986
2. Space complexity in propositional calculus;Alekhnovich,2000
3. Simplified and improved resolution lower bounds;Beame,1996
4. Short proofs are narrow, resolution made simple;Ben-Sasson,1999
5. Resolution and the weak pigeonhole principle;Buss,1997