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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 34, No. 1, pp. 1–8, January–February, 1982.
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Varekh, N.V., Shevelo, V.N. Certain properties of solutions of systems of differential equations with retarded argument. Ukr Math J 34, 1–7 (1982). https://doi.org/10.1007/BF01086125
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DOI: https://doi.org/10.1007/BF01086125