Geodesic
On spectrum-preserving approximation
Doklady Akademii Nauk, Tome 311 (1990) no. 1, pp. 32-36.

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     author = {A. M. Olevskii},
     title = {On spectrum-preserving approximation},
     journal = {Doklady Akademii Nauk},
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     publisher = {mathdoc},
     volume = {311},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_1_a5/}
}
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A. M. Olevskii. On spectrum-preserving approximation. Doklady Akademii Nauk, Tome 311 (1990) no. 1, pp. 32-36. http://geodesic.mathdoc.fr/item/DAN_1990_311_1_a5/