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Additional information
Leningrad Branch of V. A. Steklov Mathematics Institute, Academy of Sciences of the USSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 22, No. 3, pp. 53–65, July–September, 1988.
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Safarov, Y.G. Asymptotic of the spectral function of a positive elliptic operator without the nontrap condition. Funct Anal Its Appl 22, 213–223 (1988). https://doi.org/10.1007/BF01077627
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DOI: https://doi.org/10.1007/BF01077627