1. T. C. Halsey, M. H. Jensen, L. P. Kadanoff, I. Procaccia, and B. I. Shraiman, to be published.
2. D. Ruelle,Statistical Mechanics, Thermodynamic Formalism (Addison-Wesley, Reading, Massachusetts, 1978); E. B. Vul, Ya. G. Sinai, and K. M. Khanin,Uspekhi Mat. Nauk 39:3 (1984) [Russ. Math. Surv. 39:1 (1984)].
3. M. J. Feigenbaum,Commun. Math. Phys. 77:65 (1980).
4. M. J. Feigenbaum and D. Sullivan, to be published.