1. May, R. M. Nature 261, 459–467 (1976).
2. Dynamical Chaos (eds Berry, M. V., Percival, I. C. & Weiss, N. O.) (The Royal Society, London, 1987).
3. The Ubiquity of Chaos (ed. Krasner, S.) (American Association for the Advancement of Science, Washington DC, 1990).
4. Jensen, R. V. Am. Scient. 75, 168–181 (March 1987); Encyclopedia of Modern Physics, 69–96 (Academic, New York, 1990).
5. Ford, J. in The New Physics (ed. Davies, P. C. W.) 348–371 (Cambridge University Press, 1986).