Geodesic
The spectra of self-adjoint extensions of a~symmetric operator
Matematičeskie zametki, Tome 19 (1976) no. 3, pp. 429-434.

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In this article we investigate the nature of the spectra of self-adjoint extensions of a symmetric operator with equal (finite or infinite) deficiency indices. Our results are formulated in terms of abstract boundary conditions. 
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     author = {A. N. Kochubei},
     title = {The spectra of self-adjoint extensions of a~symmetric operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {429--434},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_19_3_a11/}
}
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A. N. Kochubei. The spectra of self-adjoint extensions of a~symmetric operator. Matematičeskie zametki, Tome 19 (1976) no. 3, pp. 429-434. http://geodesic.mathdoc.fr/item/MZM_1976_19_3_a11/