1) S. Ulam : Los Alamos Scientific Laboratory, Report LA-2055 (1956) T-706.
2) H. Poincare : Les Méthode Nouvelle de la Mécanique Céleste, Gauthier-Villars, Paris (1892); (in English) NASA Translation T. T. F-450/452, U. S. Fed. Clearinghouse, Springfield, V. A., U. S. A. (1967).
3) M. Month and J. C. Herrea : Nonlinear Dynamics and the Beam-Beam Interaction, Am. Inst. Phys. Conf. Proc., Vol. 57 (1979).
4) C. W. Horton, L. E. Reichl and V. G. Szebehely : Long-Time Prediction in Dynamics, (John Wiley & Sons, New York) (1982).
5) M. Toda : J. Phys. Soc. Japan 22 (1967) 431, J. Phys. Soc. Japan 23 (1967) 501.