1. Effective choice in the prisoner's dilemma;Axelrod;Journal of Conflict Resolution,1980
2. More effective choice in the prisoner's dilemma;Axelrod;Journal of Conflict Resolution,1980
3. Emergence of cooperation among egoists;Axelrod;American Political Science Review,1981
4. The Evolution of Cooperation;Axelrod,1984
5. An evolutionary approach to norms;Axelrod;American Political Science Review,1986