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Mathematics and Mechanics Institute, Bulgarian Academy of Sciences. Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 17, No. 3, pp. 37–45, July–September, 1983.
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Popov, G.S., Shubin, M.A. Asymptotic expansion of the spectral function for second-order elliptic operators in Rn . Funct Anal Its Appl 17, 193–200 (1983). https://doi.org/10.1007/BF01078101
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DOI: https://doi.org/10.1007/BF01078101