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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 28, No. 5, pp. 603–611, September–October, 1976.
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Kurnel', N.S., Maiboroda, I.N. A method of constructing two-sided approximations to solutions of operator equations. Ukr Math J 28, 467–474 (1976). https://doi.org/10.1007/BF01095205
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DOI: https://doi.org/10.1007/BF01095205