Yang, Ping A necessary and sufficient condition for oscillation of a generalized Liénard system with multiple singular points. (Chinese. English summary) Zbl 0898.34032 J. Anhui Norm. Univ., Nat. Sci. 20, No. 2, 103-107 (1997). MSC: 34C10 34C05 PDFBibTeX XMLCite \textit{P. Yang}, J. Anhui Norm. Univ., Nat. Sci. 20, No. 2, 103--107 (1997; Zbl 0898.34032)
Yang, Ming; Yang, Ping Finitely presented dimension of tensor product. (Chinese. English summary) Zbl 0903.16007 J. Anhui Norm. Univ., Nat. Sci. 19, No. 4, 315-318 (1996). MSC: 16E10 16P70 PDFBibTeX XMLCite \textit{M. Yang} and \textit{P. Yang}, J. Anhui Norm. Univ., Nat. Sci. 19, No. 4, 315--318 (1996; Zbl 0903.16007)