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M. V. Lomonosov Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 24, No. 4, pp. 31–42, October–December, 1990.
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Il'yashenko, Y.S., Khovanskii, A.G. Galois groups, Stokes operators and a theorem of Ramis. Funct Anal Its Appl 24, 286–296 (1990). https://doi.org/10.1007/BF01077333
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DOI: https://doi.org/10.1007/BF01077333