1. Axelrod, R.: The evolution of cooperation. Basic Books, New York, NY (1984)
2. Barto, A. G., Sutton, R. S., Anderson, C. W.: Neuronlike adaptive elements that can solve difficult learning control problems. IEEE Trans. Systems, Man, and Cybernetics 13 (1983) 834–846
3. Crites, R. H., Barto, A. G.: Improving elevator performance using reinforcement learning. Advances in Neural Information Processing Systems 8 (1995) (to appear)
4. Elman, J.: Finding structure in time. Cognitive Science 14 (1990) 179–211
5. Haykin, S.: Neural networks: a comprehensive foundation. Macmillan, New York, NY (1994)