1. S. Aaronson, The complexity zoo, http://www.cs.berkeley.edu/∼aaronson/zoo.html.
2. Power from random strings;Allender,2002
3. Trading group theory for randomness;Babai,1985
4. NP might not be as easy as detecting unique solutions;Beigel,1998
5. H. Buhrman, L. Fortnow, Distinguishing complexity and symmetry of information, Technical Report TR-95-11, Department of Computer Science, The University of Chicago, 1995.