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Translated from Ukrainskii Matematicheskii Zhurnal, Vol.34, No. 3, pp. 296–302, May–June, 1982.
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Kats, I.S. Theorem on integral growth estimates for the spectral functions of a string. Ukr Math J 34, 240–245 (1982). https://doi.org/10.1007/BF01682111
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DOI: https://doi.org/10.1007/BF01682111