1. Berry, M., in Quantum Chaos: Adriatico Research Conf. and Miniworkshop (Trieste,1990), Singapore: World Sci., 1991, VII.
2. Brody, T., Lett. Nuovo Cimento, 1973, vol. 7, p. 482.
3. Berry, M. and Robnik, M., J. Phys. A, 1984, vol. 17, p. 2413.
4. Gutzwiller, M., Chaos in Classical and Quantum Mechanics, New York: Springer, 1990.
5. Bunakov, V.E., in Proc. of Int. Conf. on Selected Topics in Nuclear Structure, E3-94-370, Dubna, 1994, p. 310.