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Wang, Lianglong; Wang, Caihua Existence of positive periodic solutions for retarded functional differential equations. (Chinese. English summary) Zbl 1099.34527 J. Anhui Univ., Nat. Sci. 30, No. 1, 1-3 (2006). MSC: 34K13 34K60 92D40 PDFBibTeX XMLCite \textit{L. Wang} and \textit{C. Wang}, J. Anhui Univ., Nat. Sci. 30, No. 1, 1--3 (2006; Zbl 1099.34527)