1. V. G. Gurzadyan andG. K. Savvidy:Astron. Astroph.,160, 203 (1986).
2. H. E. Kandrup:Astrophys. J.,364, 420 (1990);Phys. Lett. A,140, 97 (1989);H. E. Kandrup andH. Smith:Astrophys. J.,374, 255 (1991).
3. P. Cipriani andG. Pucacco:Proceedings of the Workshop «Ergodic Concepts in Stellar Dynamics», held in Geneva, March 1993, edited byD. Pfenniger andV. G. Gurzadyan (Springer-Verlag) to be published;Proceedings of the NATO-ASI «From Newton to Chaos», held in Cortina, July 1993, edited byA. E. Roy andB. A. Steves (Plenum Press) to be published;P. Cipriani: Dottorato di ricerca, Università di Roma (1993).
4. M. Pettini:Phys. Rev. E,47, 828 (1993);L. Casetti andM. Pettini: submitted toPhys. Rev. E.
5. D. V. Anosov:Proc. Steklov Inst. Math.,90 (1967).