@article{1103044797,
author = {Schwartz, J.},
title = {Perturbations of spectral operators, and applications. I. Bounded perturbations.},
journal = {Pacific J. Math.},
volume = {4},
number = {4},
year = {1954},
pages = { 415-458},
language = {en},
url = {http://dml.mathdoc.fr/item/1103044797}
}
Schwartz, J. Perturbations of spectral operators, and applications. I. Bounded perturbations.. Pacific J. Math., Tome 4 (1954) no. 4, pp. 415-458. http://gdmltest.u-ga.fr/item/1103044797/