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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 31, No. 4, pp. 407–416, July–August, 1979.
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Radzievskii, G.V. Completeness of derived chains corresponding to boundary problems on a semiaxis. Ukr Math J 31, 319–327 (1979). https://doi.org/10.1007/BF01085672
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DOI: https://doi.org/10.1007/BF01085672