中国科学院数学与系统科学研究院期刊网
AMS
On Edge Singularity and Eigenvectors of Mixed Graphs
Ying Ying TAN, Yi Zheng FAN
Acta Mathematica Sinica . 2008, (1): 139 -146 .  DOI: 10.1007/s10114-007-1000-2