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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 20, No. 6, pp. 791–801, November–December, 1968.
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Mitropol'skii, Y.A., Fodchuk, V.I. Stable integral manifolds for a class of singularly perturbed systems with lag. Ukr Math J 20, 683–691 (1968). https://doi.org/10.1007/BF01085237
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DOI: https://doi.org/10.1007/BF01085237