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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 37, No. 3, pp. 396–400, May–June, 1985.
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Shpakovich, V.P. Invariant manifolds of systems of equations with retardation and slowly varying phase. Ukr Math J 37, 317–321 (1985). https://doi.org/10.1007/BF01059622
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DOI: https://doi.org/10.1007/BF01059622