The coincidence of the ordinary and the almost periodic spectrum of an elliptic operator
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 3
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@article{RM_1975_30_3_a24,
author = {M. A. Shubin},
title = {The coincidence of the ordinary and the almost periodic spectrum of an elliptic operator},
journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
year = {1975},
volume = {30},
number = {3},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/RM_1975_30_3_a24/}
}
M. A. Shubin. The coincidence of the ordinary and the almost periodic spectrum of an elliptic operator. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 3. http://geodesic.mathdoc.fr/item/RM_1975_30_3_a24/
[1] B. M. Levitan, Pochti-periodicheskie funktsii, Gostekhizdat, M., 1953