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The distribution of the discrete spectrum for singular differential operators. (English. Russian original) Zbl 0249.35069
Sov. Math., Dokl. 13, 245-249 (1972); translation from Dokl. Akad. Nauk SSSR 202, 1012-1015 (1972).

MSC:
35P20 Asymptotic distributions of eigenvalues in context of PDEs
35J10 Schrödinger operator, Schrödinger equation
47A10 Spectrum, resolvent
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