1. H. Haken:Phys. Lett. A,53, 77 (1975).
2. C. T. Sparrow:The Lorenz Equations (Springer-Verlag, Berlin, 1982).
3. G. P. Flessas:Phys. Lett. A,108, 4 (1985).
4. See,e.g.,J. M. T. Thompson andH. B. Stewart:Nonlinear Dynamics and Chaos. Geometrical Methods for Engineers and Scientists (John Wiley and Sons, Chichester, 1986).
5. R. S. Schechter, M. G. Velarde andJ. K. Platten:Adv. Chem. Phys.,26, 265 (1974).