This article is from the sci.fractals FAQ, by Michael C. Taylor and Jean-Pierre Louvet with numerous contributions by others.
See:
1. A. K. Dewdney, Leaping into Lyapunov Space, "Scientific American",
Sept. 1991, pp. 178-180.
2. M. Markus and B. Hess, Lyapunov Exponents of the Logistic Map with
Periodic Forcing, "Computers and Graphics" 13, 4 (1989), pp.
553-558.
3. M. Markus, Chaos in Maps with Continuous and Discontinuous Maxima,
"Computers in Physics", Sep/Oct 1990, pp. 481-493.
 
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