1. H. P. Baltes and E. R. Hilf,Spectra of Finite Systems (Bibliographisches Institut, Mannheim, 1976).
2. M. Kac,Am. Math. Month. 73S:1 (1966).
3. V. I. Arnold and A. Avez,Ergodic Problems in Classical Mechanics (Benjamin, 1968), Chapter 3.
4. M. V. Berry, inChaotic Behaviour of Deterministic Systems (Proceedings XXXVI. Les Bouches 1981), G. Ioosset al., eds. (North-Holland, 1983), p. 173; inChaotic Behaviour in Quantum Systems (Proceedings, Como 1983), G. Casati, ed. (Plenum Press, New York, 1985).
5. O. Bohigas, M. J. Giannoni, and C. Schmit,Phys. Rev. Lett. 52:1 (1984); O. Bohigas and M. J. Giannoni, inMathematical and Computational Methods in Nuclear Physics, J. S. Dehesaet al., eds. (Springer, 1984).