On the Sufficient Conditions for the Existence of Limit Cycles of the System dx/dt=y,dy/dt=Σbijxiyj
Huang Kecheng
Acta Mathematica Sinica ›› 1985, Vol. 1 ›› Issue (3) : 255-260.
On the Sufficient Conditions for the Existence of Limit Cycles of the System dx/dt=y,dy/dt=Σbijxiyj
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