Han, Youfa; Wang, Xue; Li, Dandan Properties of coloring the annular region. (Chinese. English summary) Zbl 1463.05166 J. Liaoning Norm. Univ., Nat. Sci. 43, No. 2, 145-149 (2020). MSC: 05C15 05C10 PDFBibTeX XMLCite \textit{Y. Han} et al., J. Liaoning Norm. Univ., Nat. Sci. 43, No. 2, 145--149 (2020; Zbl 1463.05166)
Han, Youfa; Kang, Yunfeng; Dong, Ting Polynomial of coloring the graph. (Chinese. English summary) Zbl 1399.05045 J. Liaoning Norm. Univ., Nat. Sci. 40, No. 3, 289-292 (2017). MSC: 05C10 05C15 05C31 PDFBibTeX XMLCite \textit{Y. Han} et al., J. Liaoning Norm. Univ., Nat. Sci. 40, No. 3, 289--292 (2017; Zbl 1399.05045)