On the Sufficient Conditions for the Existence of Limit Cycles of the System <em>dx/dt=y,dy/dt=Σb<sub>ijx<sup>i</sup>y<sup>j</sup></sub></em>

中国科学院数学与系统科学研究院期刊网

On the Sufficient Conditions for the Existence of Limit Cycles of the System dx/dt=y,dy/dt=Σb_ijxⁱy^j

Huang Kecheng

Acta Mathematica Sinica . 1985, (3): 255 -260 . DOI: 10.1007/BF02564822