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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 27, No. 4, pp. 477–486, July–August, 1975.
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Plotkin, Y.D., Turbin, A.F. The inversion of normally solvable linear operators perturbed on the spectrum. Ukr Math J 27, 385–393 (1975). https://doi.org/10.1007/BF01085584
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DOI: https://doi.org/10.1007/BF01085584