Liu, Yuji; Liu, Xingyuan The existence of periodic solutions of higher order nonlinear periodic difference equations. (English) Zbl 1276.39007 Math. Methods Appl. Sci. 36, No. 11, 1459-1470 (2013). Reviewer: Lothar Berg (Rostock) MSC: 39A23 39A13 39A10 PDFBibTeX XMLCite \textit{Y. Liu} and \textit{X. Liu}, Math. Methods Appl. Sci. 36, No. 11, 1459--1470 (2013; Zbl 1276.39007) Full Text: DOI
Liu, Xingyuan; Liu, Yuji On positive periodic solutions of functional difference equations with forcing term and applications. (English) Zbl 1165.39306 Comput. Math. Appl. 56, No. 9, 2247-2255 (2008). MSC: 39A11 39A10 54H25 PDFBibTeX XMLCite \textit{X. Liu} and \textit{Y. Liu}, Comput. Math. Appl. 56, No. 9, 2247--2255 (2008; Zbl 1165.39306) Full Text: DOI
Liu, Xingyuan; Liu, Yuji Existence of solutions of periodic boundary value problems for impulsive functional Duffing equations at nonresonance case. (English) Zbl 1158.34337 Bound. Value Probl. 2008, Article ID 937138, 16 p. (2008). MSC: 34K10 34K45 PDFBibTeX XMLCite \textit{X. Liu} and \textit{Y. Liu}, Bound. Value Probl. 2008, Article ID 937138, 16 p. (2008; Zbl 1158.34337) Full Text: DOI EuDML