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[4] Wolfram, S., ``Cellular automata'', Los Alamos Science (fall 1983).
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[6] Guckenheimer, J. and Holmes, P., Nonlinear Oscillations, Dynamical Systems, and Bifurcations of Vector Fields, Springer-Verlag (1983).
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[11] Milnor, J., ``Entropy of cellular automaton-maps'', Institute for Advanced Study preprint (May 1984).
[12] Packard, N. and Wolfram, S., ``Two-dimensional cellular automata'', J. Stat. Phys. 38, 901 (1985).
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[19] Hedlund, G., Private communication.
[20] Milnor, J. and Wolfram, S., In preparation.
[21] Milnor, J., ``Notes on surjective cellular automaton-maps'', Institute for Advanced Study preprint (June 1984).
[22] Chaitin, G., ``Towards a mathematical definition of life'', in The Maximum Entropy Formalism'', R. D. Levine and M. Tribus (eds.), MIT press (1979).
[23] Crutchfield, J. and Packard, N., Private communication.
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[25] Amit, D., Field Theory, the Renormalization Group, and Critical Phenomena, McGraw-Hill (1978).
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[28] Grassberger, P., Physica 10D, 52 (1984).
[29] Greenberg, J. M., Hassard, B. D., and Hastings, S. P., Bull. Amer. Math. Soc. 84, 1296 (1975); Madore, B. and Freedman, W., Science 222, 615 (1983).
[30] Winfree, A. and Winfree, E., ``Organizing centers in a cellular excitable medium'', to be published.
[31] Packard, N., ``Cellular automaton models for dendritic growth'', Institute for Advanced Study preprint, in preparation.
[32] Bennett, C., Neuberger, H., Pomeau, Y. and Vichniac, G., Private communications.
[33] Martin, O., Odlyzko, A. and Wolfram, S., Comm. Math. Phys. 93, 219 (1984).
[34] Grassberger, P., Krause, F. and von der Twer, T., ``A new type of kinetic critical phenomena'', University of Wuppertal preprint WU B 83-22 (October 1983).
[35] Domany, E. and Kinzel, W., Phys. Rev. Lett. 53, 311 (1984).
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[37] Kauffman, S., Physica 10D, 145 (1984).
[38] Hopcroft, J., ``An
algorithm for minimizing states in a finite automaton'', in Proc. Int. Symp. on the Theory of Machines and Computations, Academic Press (1971).
[39] Harary, F., Graph Theory, Chapter 15, Addison-Wesley (1972).
[40] Hurd, L., ``Formal language characterizations of cellular automaton limit sets'', to be published.
[41] Hasslacher, B., Private communication.
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[46] Furstenberg, H. and Lind, D., Private communication.
[47] Berlekamp, E. R., Conway, J. H. and Guy, R. K., Winning Ways for Your Mathematical Plays, vol. 2, chap. 25, Academic Press (1982); Gardner, M., Wheels, Life and Other Mathematical Amusements, Freeman (1983).
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[51] Steiglitz, K., Private communication.
[52] Bennett, C. H., ``On the logical ``depth'' of sequences and their reducibilities to random sequences'', Info. & Control, to be published.
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[54] Sewelson, V., Private communication.
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[57] Hillis, D. and Wolfram, S., Work in progress.