中国科学院数学与系统科学研究院期刊网
AMS
On the Perturbation of Semi-Fredholm Relations with Complemented Ranges and Null Spaces
TeresaA LVAREZ
Acta Mathematica Sinica . 2010, (8): 1545 -1554 .  DOI: 10.1007/s10114-010-7700-z