Geodesic
Spectrum of some nonclassical self-adjoint extensions of the Laplace operator
Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 4.

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     author = {M. M. Gekhtman},
     title = {Spectrum of some nonclassical self-adjoint extensions of the {Laplace} operator},
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     number = {4},
     year = {1970},
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M. M. Gekhtman. Spectrum of some nonclassical self-adjoint extensions of the Laplace operator. Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 4. http://geodesic.mathdoc.fr/item/FAA_1970_4_4_a8/

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