J. JOZEFOWIEZ, J.-C. DARCHEVILLE, and P. PREUX, “AN OPERANT APPROACH TO THE ITERATED PRISONERS’ DILEMMA: EMERGENCE OF STABLE COOPERATION AFTER INDIRECT REINFORCEMENT OF CONTROLLlNG BEHAVIORS IN ARTIFICIAL LEARNING AGENTS”, MJBA, vol. 26, no. 2, pp. 211–227, May 2011.