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  • Multiplicity of positive periodic solutions to second order differential equations 

    Chu, Jifeng; Lin, Xiaoning; Jiang, Daqing; O'Regan, Donal; Agarwal, R. P. (Cambridge University Press (CUP), 2006-04-01)
    In this paper, we study the existence of positive periodic solutions to the equation x" = f (t, x). It is proved that such a equation has more than one positive periodic solution when the nonlinearity changes sign. ...