Shang, Lijun; Zhang, Di; Dang, Xinyi On periodic solution of higher order nonautonomous systems. (Chinese. English summary) Zbl 0872.34024 J. Biomath. 11, No. 2, 17-25 (1996). MSC: 34C25 PDFBibTeX XMLCite \textit{L. Shang} et al., J. Biomath. 11, No. 2, 17--25 (1996; Zbl 0872.34024)
Shang, Lijun; Zhang, Di Perturbing families of generalized Lyapunov functions and relative stability in terms of two measures. (English) Zbl 0840.34057 Ann. Differ. Equations 11, No. 3, 310-315 (1995). Reviewer: L.Hatvani (Szeged) MSC: 34D20 34D10 PDFBibTeX XMLCite \textit{L. Shang} and \textit{D. Zhang}, Ann. Differ. Equations 11, No. 3, 310--315 (1995; Zbl 0840.34057)
Shang, Lijun; Zhang, Di Existence and uniqueness of a periodic solution for a class of nonlinear discrete systems. (Chinese. English summary) Zbl 0845.39005 J. Northwest Univ., Nat. Sci. 24, No. 5, 393-394, 398 (1994). MSC: 39A12 39A10 PDFBibTeX XMLCite \textit{L. Shang} and \textit{D. Zhang}, J. Northwest Univ., Nat. Sci. Ed. 24, No. 5, 393--394, 398 (1994; Zbl 0845.39005)