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Translated from Matematicheskie Zametki, Vol. 35, No. 1, pp. 63–82, January, 1984.
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Bobodzhanov, A.A., Lomov, S.A. Asymptotic integration of the Cauchy problem with countably multiple spectrum. Mathematical Notes of the Academy of Sciences of the USSR 35, 35–47 (1984). https://doi.org/10.1007/BF01142292
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DOI: https://doi.org/10.1007/BF01142292