Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1957_115_4_a1, author = {V. N. Gol'dberg}, title = {Perturbation of linear operators with a purely discrete spectrum}, journal = {Doklady Akademii Nauk}, pages = {643--645}, publisher = {mathdoc}, volume = {115}, number = {4}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1957_115_4_a1/} }
V. N. Gol'dberg. Perturbation of linear operators with a purely discrete spectrum. Doklady Akademii Nauk, Tome 115 (1957) no. 4, pp. 643-645. http://geodesic.mathdoc.fr/item/DAN_1957_115_4_a1/