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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 26, No. 6, pp. 850–854, November–December, 1974.
The author thanks A. M. Samoilenko for posing this problem and for his constant attention to this work.
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Shlapak, Y.D. Periodic solutions of nonlinear second-order equations which are not solved for the highest derivative. Ukr Math J 26, 702–706 (1974). https://doi.org/10.1007/BF01085271
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DOI: https://doi.org/10.1007/BF01085271