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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 39, No. 3, pp. 396–397, May–June, 1987.
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Samoilenko, V.G. Modification of the spectrum of the second-quantization operator under its perturbation by a potential. Ukr Math J 39, 313–314 (1987). https://doi.org/10.1007/BF01057243
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DOI: https://doi.org/10.1007/BF01057243