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Dagestan State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 4, No. 4, p. 72, October–December, 1970.
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Gekhtman, M.M. Spectrum of some nonclassical self-adjoint extensions of the Laplace operator. Funct Anal Its Appl 4, 325–326 (1970). https://doi.org/10.1007/BF01075976
- Functional Analysis
- Laplace Operator