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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 22, No. 1, pp. 64–75, January–February, 1970.
In conclusion the author wishes to express his sincere gratitude to A. M. Samoilenko for his attention to the paper and for valuable observations.
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Tkach, B.P. Periodic solutions of systems of n-th order differential equations of neutral type with retarded argument. Ukr Math J 22, 54–63 (1970). https://doi.org/10.1007/BF01086702
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DOI: https://doi.org/10.1007/BF01086702