Buttazzoni, Paola; Fonda, Alessandro Periodic perturbations of scalar second order differential equations. (English) Zbl 0951.34024 Discrete Contin. Dyn. Syst. 3, No. 3, 451-455 (1997). Summary: The authors prove the existence of periodic solutions for perturbations of some autonomous second-order nonlinear differential equations by the use of the Poincaré-Birkhoff fixed point theorem. Cited in 4 Documents MSC: 34C25 Periodic solutions to ordinary differential equations 34A34 Nonlinear ordinary differential equations and systems Keywords:existence; periodic solutions; perturbations; autonomous second-order nonlinear differential equations PDF BibTeX XML Cite \textit{P. Buttazzoni} and \textit{A. Fonda}, Discrete Contin. Dyn. Syst. 3, No. 3, 451--455 (1997; Zbl 0951.34024) Full Text: DOI OpenURL