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The focussing problem and the asymptotic behavior of the spectral function of the Laplace-Beltrami operator. (English. Russian original) Zbl 0357.35020
Sov. Math., Dokl. 17(1976), 1414-1417 (1977); translation from Dokl. Akad. Nauk SSSR 230, 1017-1020 (1976).

MSC:
35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation
35P20 Asymptotic distributions of eigenvalues in context of PDEs
35J25 Boundary value problems for second-order elliptic equations
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