The method of two-sided approximations in eigenvalue problems
Differencialʹnye uravneniâ, Tome 15 (1979) no. 5, pp. 914-920.

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     author = {Yu. A. Kuznetsov and S. B. Sorokin},
     title = {The method of two-sided approximations in eigenvalue problems},
     journal = {Differencialʹnye uravneni\^a},
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     publisher = {mathdoc},
     volume = {15},
     number = {5},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_5_a16/}
}
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Yu. A. Kuznetsov; S. B. Sorokin. The method of two-sided approximations in eigenvalue problems. Differencialʹnye uravneniâ, Tome 15 (1979) no. 5, pp. 914-920. http://geodesic.mathdoc.fr/item/DE_1979_15_5_a16/