Geodesic
On sufficient condition for coincidence of a spectrum and width
Matematičeskie zametki, Tome 56 (1994) no. 2, pp. 143-145 
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/
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     author = {A. P. Buslaev},
     title = {On sufficient condition for coincidence of a spectrum and width},
     journal = {Matemati\v{c}eskie zametki},
     pages = {143--145},
     year = {1994},
     volume = {56},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1994_56_2_a12/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

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[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