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On the distribution of eigenvalues of the first boundary value problem in unbounded regions. (English. Russian original) Zbl 0232.35076
Sov. Math., Dokl. 12, 1539-1542 (1971); translation from Dokl. Akad. Nauk SSSR 200, 1034-1036 (1971).

MSC:
35P20 Asymptotic distributions of eigenvalues in context of PDEs
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