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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 26, No. 5, pp. 611–620, September–October, 1974.
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Martynyuk, D.I., Samoilenko, A.M. Existence of invariant manifolds of systems with delay. Ukr Math J 26, 500–507 (1974). https://doi.org/10.1007/BF01085276
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DOI: https://doi.org/10.1007/BF01085276