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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 25, No. 4, pp. 502–513, July–August, 1973.
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Shkil, N.I., Grigorenko, V.K. Asymptotic representation of solutions of system of linear differential equations with slowly varying coefficients. Ukr Math J 25, 414–423 (1973). https://doi.org/10.1007/BF01085454
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DOI: https://doi.org/10.1007/BF01085454