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Lakajev, S. N. Discrete spectrum of operator valued Friedrichs models. Commentationes Mathematicae Universitatis Carolinae, Tome 27 (1986) no. 2, pp. 341-357. http://geodesic.mathdoc.fr/item/CMUC_1986_27_2_a12/
@article{CMUC_1986_27_2_a12,
author = {Lakajev, S. N.},
title = {Discrete spectrum of operator valued {Friedrichs} models},
journal = {Commentationes Mathematicae Universitatis Carolinae},
pages = {341--357},
year = {1986},
volume = {27},
number = {2},
mrnumber = {857553},
zbl = {0601.45001},
language = {en},
url = {http://geodesic.mathdoc.fr/item/CMUC_1986_27_2_a12/}
}
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[3] ACHIEZER N. I., GLAZMAN I. M. : Theory of linear operators in Hilbert space. Nauka, Moscow, 1965 (in Russian).
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[5] EVGRAFOV M. A.: Analytical functions. Nauka, 1968 (in Russian). | MR
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