Liu, Wen Bin; Li, Yong The existence of periodic solutions for high-order Duffing equations. (Chinese. English summary) Zbl 1036.34052 Acta Math. Sin. 46, No. 1, 49-56 (2003). Summary: Here, the existence of periodic solutions to higher-order Duffing equations is studied by using degree theory. Cited in 7 Documents MSC: 34C25 Periodic solutions to ordinary differential equations Keywords:higher-order Duffing equations PDFBibTeX XMLCite \textit{W. B. Liu} and \textit{Y. Li}, Acta Math. Sin. 46, No. 1, 49--56 (2003; Zbl 1036.34052)