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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 41, No. 11, pp. 1512–1521, November, 1989.
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Petunin, Y.I., Savkin, V.I. Continuity of maps inverse to quadratic operator polynomials. Ukr Math J 41, 1302–1309 (1989). https://doi.org/10.1007/BF01056499
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DOI: https://doi.org/10.1007/BF01056499