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F. M. Dannan, “On the stability of solutions of second order linear differential equations with periodic coefficients,” Ukrainsk. Matem. Zh.,25, No. 3 (1973).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 25, No. 4, pp. 528–532, July–August, 1973.
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Dannan, F.M. On the stability of a system of two linear differential equations with periodic coefficients. Ukr Math J 25, 436–440 (1973). https://doi.org/10.1007/BF01085458
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DOI: https://doi.org/10.1007/BF01085458