Han, Mao An et Qian, Ti Fei, Uniqueness of Periodic Solutions for Certain Second-Order Equations, Acta mathematica Sinica. English series (Print) , 20(2), 2004, pp. 247-254
We establish a criterion for the uniqueness of periodic solutions for a class of second-order equations. We also give an application to a polynomial system and corrections to some known results.