1. Polynomial time truth-table reductions to p-selective sets;Agrawal,1994
2. Self-reducibility;Balcázar;J. Comput. System Sci.,1990
3. NP-hard sets are p-superterse unless R = NP;Beigel,1988
4. Approximable sets;Beigel,1994
5. Selective self-reducible sets: a new characterization of P;Buhrman,1993