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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 35, No. 1, pp. 124–130, January–February, 1983.
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Shkil', N.I., Konet, I.M. Asymptotic properties of formal fundamental matrices of systems of second-order linear differential equations that contain a parameter. Ukr Math J 35, 113–118 (1983). https://doi.org/10.1007/BF01093179
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DOI: https://doi.org/10.1007/BF01093179