1. M.-J. Giannoni, A. Voros, J. Zinn-Justin (Eds.), Proceedings of the 1989 Les Houches Summer School on “Chaos and Quantum Physics”, Elsevier Science Publishers B.V., Amsterdam, 1991. ∗∗∗
2. M.C. Gutzwiller, Chaos in Classical and Quantum Mechanics, Springer, New York, 1990. ∗∗∗
3. L.D. Landau, E.M. Lifshitz, Quantum Mechanics, Non-Relativistic Theory, Course of Theoretical Physics, Vol. 3, Pergamon Press, Oxford, 1958.
4. M.V. Berry, Semiclassical theory of spectral rigidity, Proc. Roy. Soc. London A 400 (1985) 229. ∗∗∗
5. Gutzwiller's trace formula and spectral statistics: beyond the diagonal approximation;Bogomolny;Phys. Rev. Lett.,1996