中国科学院数学与系统科学研究院期刊网
AMS
Partial Isometries and an Invariant of C*-algebras
Hong Liang YAO, Xiao Chun FANG
Acta Mathematica Sinica . 2011, (4): 799 -806 .  DOI: 10.1007/s10114-011-8053-y