1. V.I. Arnol’d: Ordinary Differential Equations Translated from the Russian and edited by Richard A. Silverman. The M.I.T. Press, Cambridge, Mass. 1973
2. M. Benedicks, R. Moeckel: An attractor for the Hénon map. Preprint
3. P. Blanchard, R. L. Devaney, G. R. Hall: Differential Equations Brooks/Cole, Pacific Grove, Calif. 1998
4. S-N. Chow, E. S. Van Vleck: A shadowing lemma approach to global error analysis for initial value ODEs. SIAM J. Sci. Comput. 15 (1994), 959–976
5. C. Conley: Isolated Invariant Sets and the Morse Index. CBMS Lecture Notes 38. AMS, Providence, RI 1978