1. Arnold, V. I.: 1978, Mathematical Methods for Classical Mechanics, trans. K. Vogtmann and A. Weinstein, Springer-Verlag, New York.
2. Batterman, R. W.: forthcoming, ?Defining Chaos?.
3. Berry, M. V.: 1983, ?Semi-classical Mechanics of Regular and Irregular Motion?, in G. Ioos, R. G. H. Helleman, and R. Stora (eds.), Chaotic Behaviour of Deterministic Systems (Les Houches, Session 36), North-Holland, Amsterdam, pp. 171?271.
4. Berry, M. V.: 1985, ?Semiclassical Theory of Spectral Rigidity?, Proc. R. Soc. Lond. A. 400, 229?51.
5. Berry, M. V.: 1987, ?The Bakerian Lecture. Quantum Chaology?, in M. V. Berry, I. C. Percival, and N. O. Weiss (eds.), Dynamical Chaos, Princeton University Press, Princeton, pp. 183?98.