Ackley, D. and M. Littman (1991). Interactions between learning and evolution. In C. Langton, C. Taylor, J. Farmer, and S. Rasmussen (Eds.), Artificial life II, pp. 487--509. Redwood City, CA: Addison-Wesley.

Axelrod, R. (1984). The evolution of cooperation. New York: Basic Books.

Axelrod, R. (1987). The evolution of strategies in the iterated prisoner's dilemma. In L. Davis (Ed.), Genetic algorithms and simulated annealing, Chapter 3, pp. 32--41. Los Altos, CA: Morgan Kaufmann Publishers, Inc.

Belew, R. (1990). Evolution, learning, and culture: Computational metaphors for adaptive algorithms. Complex Systems 4, 11--49.

Cheney, D. and R. Seyfarth (1990). How monkeys see the world: Inside the mind of another species. Chicago: Univ. of Chicago Press.

Collins, R. and D. Jefferson (1991). Antfarm: Towards simulated evolution. In C. Langton, C. Taylor, J. Farmer, and S. Rasmussen (Eds.), Artificial life II, pp. 579--601. Redwood City, CA: AddisonWesley.

Dawkins, R. (1976). The selfish gene. Oxford: Oxford University Press.

Hamilton, W. (1964). The genetical evolution of social behaviour (i and ii). Journal of Theoretical Biology 156, 1--52.

Hinton, G. and S. Nowlan (1987). How learning can guide evolution. Complex Systems 1, 495--502.

Holland, J. (1975). Adaptation in natural and artificial systems. Ann Arbor, MI: The Univ. of Michigan Press.

Hurford, J. (1989). Biological evolution of the saussurean sign as a component of the language acquistion device. Lingua 77, 187--222.

Hutchins, E. and B. Hazelhurst (1991). Learning in the cultural process. In C. Langton, C. Taylor, J. Farmer, and S. Rasmussen (Eds.), Artificial life II, pp. 689--706. Redwood City, CA: AddisonWesley.

Lindgren, K. (1991). Evolutionary phenomena in simple dynamics. In C. Langton, C. Taylor, J. Farmer, and S. Rasmussen (Eds.), Artificial life II, pp. 295-311. Redwood City, CA: Addison-Wesley.

Nolfi, S., J. Elman, and D. Parisi (1990, July). Learning and evolution in neural networks. Technical Report 9019, CRL, University of California, San Diego.

Oliphant, M. (1994). Evolving cooperation in the noniterated prisoner's dilemma: The importance of spatial organization. In R. Brooks and P. Maes (Eds.), Proceedings of the fourth artificial life workshop, Cambridge, MA, pp. 349--352. MIT Press.

Parisi, D., S. Nolfi, and F. Cecconi (1991, June). Learning, behavior, and evolution. Technical Report PCIA-91-14, CNR, Rome.

Saussure, F. d. (1959). Course in general liguistics. New York: McGraw-Hill.

Werner, G. and M. Dyer (1991). Evolution of communication in artificial organisms. In C. Langton, C. Taylor, J. Farmer, and S. Rasmussen (Eds.), Artificial life II, pp. 659--687. Redwood City, CA: Addison-Wesley.

Yanco, H. and L. Stein (1992). An adaptive communication protocol for cooperating mobile robots. In Conference on the simulation of adaptive behavior: From animals to animats, Honolulu, Hawaii.