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Translated from Matematicheskie Zametki, Vol. 50, No. 6, pp. 142–145, December, 1991.
In conclusion, the authors thank A. A. Shkalikov for assistance with this note.
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Boimatov, K.K., Sultanaev, Y.T. Estimation of the negative spectrum of a lower semibounded self-adjoint operator. Mathematical Notes of the Academy of Sciences of the USSR 50, 1313–1315 (1991). https://doi.org/10.1007/BF01158276
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DOI: https://doi.org/10.1007/BF01158276