A theorem on the spectra of a perturbed differential operator
Doklady Akademii Nauk, Tome 112 (1957) no. 6, pp. 994-997
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@article{DAN_1957_112_6_a3,
author = {V. B. Lidskii},
title = {A theorem on the spectra of a perturbed differential operator},
journal = {Doklady Akademii Nauk},
pages = {994--997},
publisher = {mathdoc},
volume = {112},
number = {6},
year = {1957},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/DAN_1957_112_6_a3/}
}
V. B. Lidskii. A theorem on the spectra of a perturbed differential operator. Doklady Akademii Nauk, Tome 112 (1957) no. 6, pp. 994-997. http://geodesic.mathdoc.fr/item/DAN_1957_112_6_a3/