@article{1029001364,
author = {Olsen, Catherine L. and Plastiras, Joan K.},
title = {Quasialgebraic operators, compact perturbations, and the essential norm.},
journal = {Michigan Math. J.},
volume = {21},
number = {3},
year = {1975},
pages = { 385-397},
language = {en},
url = {http://dml.mathdoc.fr/item/1029001364}
}
Olsen, Catherine L.; Plastiras, Joan K. Quasialgebraic operators, compact perturbations, and the essential norm.. Michigan Math. J., Tome 21 (1975) no. 3, pp. 385-397. http://gdmltest.u-ga.fr/item/1029001364/