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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 19, No. 3, pp. 646–653, May–June, 1978.
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Markus, A.S., Sementsul, A.A. Operators which weakly perturb the spectrum. Sib Math J 19, 455–460 (1978). https://doi.org/10.1007/BF01875297
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DOI: https://doi.org/10.1007/BF01875297