1. T. Banks, A. Casher, Nucl. Phys. B 169 (1980) 103.
2. M.A. Halasz, J.J.M. Verbaarschot, Phys. Rev. Lett. 74 (1995) 3920; M.A. Halasz, T. Kalkreuter, J.J.M. Verbaarschot, Nucl. Phys. B (Proc. Suppl.) 53 (1997) 266.
3. O. Bohigas, M.-J. Giannoni, C. Schmit, Phys. Rev. Lett. 52 (1984) 1.
4. Reviews on the subject of quantum chaos are: M.C. Gutzwiller, Chaos in Classical and Quantum Mechanics, Springer, New York, 1990; M.-J. Giannoni, A. Voros (Eds.), Proceedings of the LII Session of the Les Houches School, Chaos and Quantum Physics, North-Holland, Amsterdam, 1991; G. Casati, B.V. Chirikov (Eds.), Quantum Chaos: Between Order and Disorder Cambridge Univ. Press, Cambridge, 1995.
5. B.L. Al'tshuler, I.Kh. Zharekeshev, S.A. Kotochigova, B.I. Shklovskiĭ, Zh. Eksp. Teor. Fiz. 94 (1988) 343 [Sov. Phys. JETP 67 (1988) 625]; B.I. Shklovskiĭ, B. Shapiro, B.R. Sears, P. Lambrianides, H.B. Shore, Phys. Rev. B 47 (1993) 11487.