共 5 条
- [1] Cronin J., Bifurcation of periodic solutions, J. Math. Anal. Appl, 68, 1, pp. 130-151, (1979)
- [2] Spiring F., Sequence of bifurcations in a three-dimensional system with a critical point, ZAMP, 34, 3, pp. 259-276, (1973)
- [3] Langman K.A., Bifurcation and stability of a periodic solution from zero eigenvalue, J. Austral. Math. Soc., 21, 1, pp. 2-20, (1973)
- [4] Flockerzi D., Bifurcation formulas for O. D. E's in R<sup>n</sup>, Nonlin. Anal: Theory, Meth. Appl., 5, 3, pp. 249-263, (1981)
- [5] Grudo E.I., Periodic solutions of periodic differential systems in the general critical case, Differents. Uravn., 18, 5, pp. 763-767, (1982)