Geodesic
The point spectrum of the one-dimensional Schrödinger operator
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 4 
A. Ya. Gordon. The point spectrum of the one-dimensional Schrödinger operator. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 4. http://geodesic.mathdoc.fr/item/RM_1976_31_4_a16/
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     author = {A. Ya. Gordon},
     title = {The point spectrum of the one-dimensional {Schr\"odinger} operator},
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     year = {1976},
     volume = {31},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1976_31_4_a16/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] N. Danford, Dzh. Shvarts, Lineinye operatory. Spektralnaya teoriya, Mir, M., 1966

[2] F. Trikomi, Differentsialnye uravneniya, IL, M., 1962

[3] V. A. Yakubovich, V. M. Starzhinskii, Lineinye differentsialnye uravneniya s periodicheskimi koeffitsientami, Nauka, M., 1972 | MR