1. P. Bergé, Y. Pomeau, Ch.Vidal, Order within Chaos, Wiley, New York, 1984.
2. H.G. Schuster, Deterministic Chaos, VCH, Weinheim, 1988.
3. H. Mori, H. Hata, T. Horita, T. Kobayashi, Prog. Theor. Phys. (Suppl. 99) (1989) 1 and references cited therein.
4. P. Cvitanović (Ed.), Universality in Chaos, Adam Hilger, Bristol, 1984.
5. E. Ott, Chaos in Dynamical Systems, Cambridge University Press, Cambridge, 1993.