[1] K. R. MEYER:
Generic bifurcation of periodic points. to appear in Trans. Amer. Math. Soc.
MR 0259289 |
Zbl 0198.42902
[2] J. SOTOMAYOR:
Generic one-parameter families of vector fields. Bull. Am. Math. Soc. 74 (1968), 722-726.
MR 0231412
[3] R. ABRAHAM J. ROBBIN:
Transversal mappings and flows. Benjamin 1967.
MR 0240836
[6] P. HARTMAN:
Ordinary differential aquations. Wiley 1964.
MR 0171038