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Additional information
Translated from Teoriya Funktsii, Funktsional'nyi Analiz i Ikh Prilozheniya, No. 48, pp. 46–51, 1987.
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Vlasenko, L.A. On the completeness of the normal solutions of the equation Au′(t) + Bu(t) = f(t). J Math Sci 49, 883–886 (1990). https://doi.org/10.1007/BF02205633
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DOI: https://doi.org/10.1007/BF02205633