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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 23, No. 2, pp. 168–176, March–April, 1971.
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Plotkin, Y.D., Turbin, A.F. Inversion of linear operators perturbed on the spectrum. Ukr Math J 23, 143–150 (1971). https://doi.org/10.1007/BF01086604
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DOI: https://doi.org/10.1007/BF01086604