1. Hassan K. Khalil, Nonlinear Systems. Prentice-Hall, 3nd edition.
2. JJ E. Slotine, W. Li, Applied Nonlinear Control. Prentice-Hallm, International editions.
3. Alan Wolf, Jack B. Swift, Harry L. Swinney, John A. Vastano Determining Lyapunov exponents from a time series (1985), 16(3), p. 285–317.
4. http://en.wikipedia.org/wiki/Fractal_dimension, 2010.05.05.
5. http://en.wikipedia.org/wiki/Bifurcation_diagram, 2010.05.05.