1. S.A. Rice in Advances in Laser Chemistry, ed. A. Zewail, Springer-Verlag, Berlin (1978), p.2.
2. See, for example, Topics in Nonlinear Dynamics, ed. S. Jorna, A.I.P. Conf. Proc. 46, New York (1978).
3. The Toda system, described in Section 2, is one such exception.
4. J. Ford, Adv.Chem.Phys. 24, 155 (1973).
5. J. Ford, in Fundamental Problems in Statistical Mechanics, Vol. 3, ed. E.D.G. Cohen, North Holland, Amsterdam (1975), p.215.