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Translated from Matematicheskie Zametki, Vol. 47, No. 5, pp. 3–13, May, 1990.
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Avakov, E.R. Theorems on estimates in the neighborhood of a singular point of a mapping. Mathematical Notes of the Academy of Sciences of the USSR 47, 425–432 (1990). https://doi.org/10.1007/BF01158081
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DOI: https://doi.org/10.1007/BF01158081