中国科学院数学与系统科学研究院期刊网
(NCI) Operators and (NFI) Operators
Li Qiong LIN, Huai Jie ZHONG, Yun Nan ZHANG
Acta Mathematica Sinica, Chinese Series . 2012, (3): 489 -498 .  DOI: 10.12386/A2012sxxb0046