中国科学院数学与系统科学研究院期刊网
AMS
The Weyl’s Theorem and Its Perturbations in Semisimple Banach Algebra
Ying Ying KONG, Li Ning JIANG, Yan Xun REN
Acta Mathematica Sinica . 2021, (5): 675 -688 .  DOI: 10.1007/s10114-021-0434-2