1. J.E. Bayfield and P.M. Koch, Phys. Rev. Lett. 33:258 (1974).
2. P.M. Koch, Fundamental Aspects of Quantum Theory, eds. V. Gorini and A. Frigerio (Plenum 1986).
3. J. Ford, in The New Physics, eds. S. Capelin and P.C.W. Davies (Cambridge University Press 1986).
4. For examples, see Stochastic Behavior in Classical and Quantum Hamiltonian Systems, Lecture Notes in Physics V. 93. eds. G. Casati and J. Ford (Springer-Verlag 1979); Chaotic Behavior in Quantum Systems, ed. G. Casati (Plenum 1985).
5. G. Casati, J. Ford, I Guarneri, and F. Vivaldi, Phys Rev. A34. 1413 (1986).