PDF(421 KB)
On the Existence of Periodic Solutions for a Nonlinear System of Ordinary Differential Equations
Zhao Li LIU
Acta Mathematica Sinica, Chinese Series ›› 2000, Vol. 43 ›› Issue (5) : 947-954.
PDF(421 KB)
PDF(421 KB)
On the Existence of Periodic Solutions for a Nonlinear System of Ordinary Differential Equations
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