MathSciNet bibliographic data MR1103031 (92c:34050) 34C25 (34B15) Tineo, Antonio Existence of two periodic solutions for the periodic equation \$\ddot x=g(t,x)\$$\ddot x=g(t,x)$. J. Math. Anal. Appl. 156 (1991), no. 2, 588–596. Article

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