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Additional information
M. V. Lomonosov Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 23, No. 1, pp. 92–93, January–March, 1989.
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Shapiro, B.Z. Linear differential equations and real flag manifolds. Funct Anal Its Appl 23, 82–83 (1989). https://doi.org/10.1007/BF01078590
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DOI: https://doi.org/10.1007/BF01078590