MathSciNet bibliographic data MR393673 (52 #14482) 34C25 Jacobowitz, Howard Periodic solutions of $x\sp{\prime\prime}+f(x,t)=0$$x\sp{\prime\prime}+f(x,t)=0$ via the Poincaré-Birkhoff theorem. J. Differential Equations 20 (1976), no. 1, 37–52. Article

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