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Vladimir Polytechnic Institute. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 19, No. 2, pp. 1–10, April–June, 1985.
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Davydov, A.A. Normal form of a differential equation, not solvable for the derivative, in a neighborhood of a singular point. Funct Anal Its Appl 19, 81–89 (1985). https://doi.org/10.1007/BF01078387
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DOI: https://doi.org/10.1007/BF01078387