中国科学院数学与系统科学研究院期刊网
A Note on Two-degree Integral Subgraph of q-Tree and Added-vertex q-Tree on n Vertices with Their Chromatic Polynomials
LIU Ying, ZENG Weiliang, LIU Huanping
Acta Mathematicae Applicatae Sinica . 2010, (1): 78 -87 .  DOI: 10.12387/C2010008