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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 26, No. 5, pp. 701–708, September–October, 1974.
The author is sincerely grateful to Yu. A. Mitropol'skii for his help during the writing of this paper.
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Yatsyuk, V.T. The existence of quasiperiodic solutions of systems of differential equations of the second order. Ukr Math J 26, 578–584 (1974). https://doi.org/10.1007/BF01085291
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DOI: https://doi.org/10.1007/BF01085291