1. M.J. Feigenbaum, J. Stat. Phys. 19 (1978) 25; 21 (1979) 669.
2. J. Milnor, W. Thurston, On iterated maps of the interval, I and II, Preprints, Princeton, 1977; published, in: J.C. Alexander (Ed.), Dynamical Systems, Proceedings, University of Maryland 1986-87, Lecture Notes in Mathematics, vol. 1342, Springer-Verlag, Berlin, 1988, p. 465.
3. P. Collet, J.-P. Eckmann, Iterated Maps on the Interval as Dynamical Systems, Progress in Physics, vol. 1, Birkhäuser, Boston, 1980.
4. B.-L. Hao, Elementary Symbolic Dynamics and Chaos in Dissipative Systems, World Scientific, Singapore, 1989.