1. Agre, P.E. & Chapman, D. (1987). Pengi: An implementation of a theory of activity. Proceedings Sixth National Conference on Artificial Intelligence (pp. 268?272).
2. Antonisse, H.J. & Keller, K.S. (1987). Genetic operators for high-level knowledge representations. Proceedings of the Second International Conference Genetic Algorithms and Their Applications (pp. 69?76). Cambridge, MA: Erlbaum.
3. COINS Technical Report;A.G. Barto,1989
4. Bickel, A.S. & Bickel, R.W. (1987). Tree structured rules in genetic algorithms. Proceedings of the Second International Conference Genetic Algorithms and Their Applications (pp. 77?81). Cambridge, MA: Erlbaum.
5. Booker, L.B. (1982). Intelligent behavior as adaptation to the task environment. Doctoral dissertation, Department of Computer and Communications Sciences, University of Michigan, Ann Arbor, Ann Arbor, MI.