中国科学院数学与系统科学研究院期刊网
The C~*-Algebras of Possibly Row-Infinite Directed Graphs
Xiao Chun FANG,Rong CHENG, Bo
Acta Mathematica Sinica, Chinese Series . 2004, (4): 687 -694 .  DOI: 10.12386/A2004sxxb0087