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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 37, No. 4, pp. 501–506, July–August, 1985.
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Kulik, V.L. Weakly regular linear systems of differential equations. Ukr Math J 37, 401–405 (1985). https://doi.org/10.1007/BF01055958
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DOI: https://doi.org/10.1007/BF01055958