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Rostov on the Don. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 29, No. 2, pp. 115–123, March–April, 1988.
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Levendorskii, S.Z. Asymptotics of the discrete spectrum of the Dirac operator with decreasing potential. Sib Math J 29, 253–259 (1988). https://doi.org/10.1007/BF00969737
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DOI: https://doi.org/10.1007/BF00969737