1. E. Ott, Chaos in Dynamical Systems (Cambridge University Press, Cambridge, 1997)
2. H.G. Schuster, W. Just, Deterministic Chaos: An Introduction (Wiley-VCH, Weinhein, 2005)
3. M. Lakshmanan, S. Rajasekar, Nonlinear Dynamics: Integrability, Chaos and Patterns (Springer, Berlin, 2003)
4. G. Galileo, Galileo first introduced the notion of resonance (resonanza), in Dialogues Concerning Two New Sciences, translated by H. Crew and A. De Salvio (Dover, New York, 1954), pp. 97–99
5. N. Minorsky, Nonlinear Oscillations (Van Nostrand, New York, 1962)