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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 28, No. 5, pp. 655–662, September–October, 1976.
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Sotnichenko, N.A., Feshchinko, S.F. An asymptotic solution for differential equations in a Banach space in the presence of a finite system of multiple eigenvalues. Ukr Math J 28, 506–512 (1976). https://doi.org/10.1007/BF01095211
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DOI: https://doi.org/10.1007/BF01095211