中国科学院数学与系统科学研究院期刊网
Multiplicative Perturbation Theorems for Regularized Cosine Operator Functions
Fang LI,Jing LIANG,Ti Jun XIAO
Acta Mathematica Sinica, Chinese Series . 2003, (1): 119 -130 .  DOI: 10.12386/A2003sxxb0017