MathSciNet bibliographic data MR2025190 34C05 (34C07) Sabatini, M. On the period function of $x''+f(x)x^{\prime 2}+g(x)=0$$x''+f(x)x^{\prime 2}+g(x)=0$. J. Differential Equations 196 (2004), no. 1, 151–168. Article

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