Liu, Xin Properties of \(k\)-critically \(n\)-connected digraphs. (Chinese. English summary) Zbl 0964.05514 J. Xinjiang Univ., Nat. Sci. 8, No. 1, 7-11 (1991). MSC: 05C20 05C40 PDFBibTeX XMLCite \textit{X. Liu}, J. Xinjiang Univ., Nat. Sci. 8, No. 1, 7--11 (1991; Zbl 0964.05514)
Liu, Xin A property of spectra of digraphs. (Chinese. English summary) Zbl 0964.05539 J. Xinjiang Univ., Nat. Sci. 7, No. 4, 16-18 (1990). MSC: 05C50 05C20 PDFBibTeX XMLCite \textit{X. Liu}, J. Xinjiang Univ., Nat. Sci. 7, No. 4, 16--18 (1990; Zbl 0964.05539)
Liu, Xin The connectivity of directed circulant graphs. (Chinese. English summary) Zbl 0964.05530 J. Xinjiang Univ., Nat. Sci. 7, No. 3, 31-34 (1990). MSC: 05C40 05C20 PDFBibTeX XMLCite \textit{X. Liu}, J. Xinjiang Univ., Nat. Sci. 7, No. 3, 31--34 (1990; Zbl 0964.05530)