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Literature cited
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol.19, No. 4, pp. 125–132, July–August, 1967.
The author uses the occasion to express his gratitude to Yu. A. Mitropol'skii and A. M. Samoilenko for their continuous attention to this work.
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Martynyuk, D.I. Periodical solutions of nonlinear differential equations of second order with a Lagging argument. Ukr Math J 19, 489–494 (1967). https://doi.org/10.1007/BF01090410
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DOI: https://doi.org/10.1007/BF01090410