中国科学院数学与系统科学研究院期刊网
The Essential Spectrum and Banach Reducibility of Operator Weighted Shifts
Jue Xian LI(1),You Qing JI(2),
Acta Mathematica Sinica, Chinese Series . 2003, (3): 469 -480 .  DOI: 10.12386/A2003sxxb0066