中国科学院数学与系统科学研究院期刊网
The Representations of Generalized Inverses of Lower Triangular Operators
Chun Fang SHAO, Hong Ke DU, Shu Feng JI, Jun Lian XU
Acta Mathematica Sinica . 2009, (12): 2107 -2118 .  DOI: 10.1007/s10114-009-7562-4