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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 23, No. 1, pp. 63–70, January–February, 1971.
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Valeev, K.G., Vazhgovskaya, M.Y. Investigation of stability in resonance cases. Ukr Math J 23, 53–59 (1971). https://doi.org/10.1007/BF01086588
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DOI: https://doi.org/10.1007/BF01086588