@article{paperid:1015360,
author = {Sal Moslehian, Mohammad and Sadeghi, Ghadir},
title = {Perturbation of closed range operators},
journal = {Turkish Journal of Mathematics},
year = {2009},
volume = {33},
number = {4},
month = {October},
issn = {1300-0098},
pages = {143--149},
			numpages = {6},
keywords = {Hilbert space; perturbation; Hyers–Ulam stability; closed operator; semi-Fredholm operator.},
}