Luo Dingjun（罗定军）.PERIODIC SOLUTIONS OF FORCED LIENARD EQUATIONS[J].Chinese Annals of Mathematics B,1992,13(3):341~349
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Authors：
Luo Dingjun（罗定军）;
Abstract：
The existence of periodic solutions of the nonlinear system $[\mathop x\limits^{..} + f(x)\mathop x\limits^. + g(t,x) = c(t)\]$ is studied by using the theory of nonhomogeneous linear periodic systems and the Schauder fixed point theorem.
