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P. N. Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 23, No. 2, pp. 178–190, May, 1975.
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Sakharov, A.D. Spectral density of eigenvalues of the wave equation and vacuum polarization. Theor Math Phys 23, 435–444 (1975). https://doi.org/10.1007/BF01036152
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DOI: https://doi.org/10.1007/BF01036152