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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 27, No. 1, pp. 137–140, January–February, 1975.
The author wishes to thank A. M. Samoilenko for posing this problem to him and for his constant attention to the work.
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Shlapak, Y.D. Periodic solutions of a linear system of differential equations with a degenerate matrix acting on the derivatives. Ukr Math J 27, 114–116 (1975). https://doi.org/10.1007/BF01085854
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DOI: https://doi.org/10.1007/BF01085854