1. The Limits of Organization;K. Arrow,1974
2. Does fairness prevent market clearing? An experimental investigation;E. Fehr,1993
3. Cooperation among strangers with limited information about reputation;G.E. Bolton,2005
4. Evolution of indirect reciprocity;M.A. Nowak,2005
5. Evolution of indirect reciprocity by image scoring;M.A. Nowak,1998