中国科学院数学与系统科学研究院期刊网
AMS
Trees, Unicyclic Graphs and Bicyclic Graphs with Exactly Two Q-main Eigenvalues
Lin CHEN, Qiong Xiang HUANG
Acta Mathematica Sinica . 2013, (11): 2193 -2208 .  DOI: 10.1007/s10114-013-1629-y