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On the eigenvalues of the first boundary value problem in unbounded domains. (English. Russian original) Zbl 0267.35063
Math. USSR, Sb. 18(1972), 235-248 (1973); translation from Mat. Sb., n. Ser. 89(131), 234-247 (1972).

MSC:
35P15 Estimates of eigenvalues in context of PDEs
35P20 Asymptotic distributions of eigenvalues in context of PDEs
35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation
47A10 Spectrum, resolvent
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