Ma, Shiwang; Wang, Zhicheng; Yu, Jianshe Periodic solutions to Duffing equations with delay. (English) Zbl 0981.34063 Differ. Equ. Dyn. Syst. 8, No. 3-4, 243-255 (2000). Summary: By using the Brouwer degree theory and a continuation theorem based on Mawhin’s coincidence degree, some existence results are proved for periodic solutions to Duffing equations with delay and some known results are extended. Cited in 4 Documents MSC: 34K13 Periodic solutions to functional-differential equations Keywords:existence; periodic solutions PDF BibTeX XML Cite \textit{S. Ma} et al., Differ. Equ. Dyn. Syst. 8, No. 3--4, 243--255 (2000; Zbl 0981.34063) OpenURL