Geodesic
On sufficient condition for coincidence of a spectrum and width
Matematičeskie zametki, Tome 56 (1994) no. 2, pp. 143-145.

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     title = {On sufficient condition for coincidence of a spectrum and width},
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     pages = {143--145},
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     number = {2},
     year = {1994},
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     url = {http://geodesic.mathdoc.fr/item/MZM_1994_56_2_a12/}
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A. P. Buslaev. On sufficient condition for coincidence of a spectrum and width. Matematičeskie zametki, Tome 56 (1994) no. 2, pp. 143-145. http://geodesic.mathdoc.fr/item/MZM_1994_56_2_a12/

[1] Gantmakher F. R., Teoriya matrits, Nauka, M., 1976

[2] Tikhomirov V. M., Nekotorye voprosy teorii priblizheniya, Izd-vo MGU, M., 1976

[3] Pinkus A., $n$-width in approximation theory, Springer, 1985

[4] Pinkus A., Linear Algebra Appl., 64 (1985), 141–156 | DOI | MR | Zbl

[5] Buslaev A. P., Matem. zametki, 47:1 (1990), 39–46 | MR | Zbl