Liu, Yongqing; Li, Yuanqing Basic theory of singular systems of linear time varying differential difference equations. (English) Zbl 0976.34055 Dyn. Contin. Discrete Impulsive Syst. 4, No. 1, 139-148 (1998). MSC: 34K05 PDFBibTeX XMLCite \textit{Y. Liu} and \textit{Y. Li}, Dyn. Contin. Discrete Impulsive Syst. 4, No. 1, 139--148 (1998; Zbl 0976.34055)
Li, Yuanqing; Liu, Yongqing Basic theory and exponential estimates of solutions for a class of singular linear functional differential equations with delay. (English) Zbl 0876.34070 Dyn. Contin. Discrete Impulsive Syst. 2, No. 2, 161-170 (1996). Reviewer: A.Rodkina (Voronezh) MSC: 34K05 PDFBibTeX XMLCite \textit{Y. Li} and \textit{Y. Liu}, Dyn. Contin. Discrete Impulsive Syst. 2, No. 2, 161--170 (1996; Zbl 0876.34070)