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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 35P20 35J25
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