Feng, Dexing; Li, Shujie A class of nonlinear models of population growth. (Chinese. English summary) Zbl 0637.92012 J. Syst. Sci. Math. Sci. 7, 360-365 (1987). MSC: 92D25 34C25 34E99 PDFBibTeX XMLCite \textit{D. Feng} and \textit{S. Li}, J. Syst. Sci. Math. Sci. 7, 360--365 (1987; Zbl 0637.92012)
Li, Shujie; Feng, Dexing The unique existence of a periodic solution for a class of ordinary differential equations systems at resonance. (Chinese. English summary) Zbl 0618.34032 J. Syst. Sci. Math. Sci. 6, 241-246 (1986). MSC: 34C25 PDFBibTeX XMLCite \textit{S. Li} and \textit{D. Feng}, J. Syst. Sci. Math. Sci. 6, 241--246 (1986; Zbl 0618.34032)