1. R. Abraham and J. Robbin,Transversal Mappings and Flows (Benjamin, New York, 1967).
2. A. Banyaga, R. de la Llave, and C. E. Wayne, Cohomology equations and geometric versions of Sternberg linearization theorem [mp_arc preprint 94-135].
3. N. Bogoliubov and A. Mitropolskii,Asymptotic Methods in the Theory of Nonlinear Oscillations (Gordon and Breach, New York, 1960).
4. M. Le Bellac,Des phénomènes critiques aux champs de jauge (Intereditions/Ed. du CNRS, Paris, 1988).
5. P. Collet, J.-P. Eckmann, and H. Koch, Period-doubling bifurcations for families of maps on ℝn,J. Stat. Phys. 25:1–14 (1980).