中国科学院数学与系统科学研究院期刊网
Drazin Invertibility and the Expression of the Drazin Inverse of a Perturbed Operator
Kai Fan YANG, Hong Ke DU
Acta Mathematica Sinica, Chinese Series . 2010, (6): 1187 -1192 .  DOI: 10.12386/A2010sxxb0132