Zhang, Zhengqiu; Yu, Jianshe Periodic solutions to a kind of delay Duffing equation. (Chinese. English summary) Zbl 0921.34066 Appl. Math., Ser. A (Chin. Ed.) 13, No. 4, 389-392 (1998). Summary: The Duffing equation \(ax''+bx+g(x(t-\tau))=p(t)\) is considered, using the theory of coincidence degree. A sufficient condition for the existence of at least one \(2\pi\)-periodic solution is obtained. Cited in 1 Document MSC: 34K13 Periodic solutions to functional-differential equations 34C25 Periodic solutions to ordinary differential equations Keywords:delay Duffing equation; existence PDF BibTeX XML Cite \textit{Z. Zhang} and \textit{J. Yu}, Appl. Math., Ser. A (Chin. Ed.) 13, No. 4, 389--392 (1998; Zbl 0921.34066) OpenURL