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Translated fromMatematicheskie Zametki, Vol. 61, No. 4, pp. 634–636, April, 1997.
Translated by I. P. Zvyagin
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Parfenov, O.G. Estimates of the spectrum of some differential operators. Math Notes 61, 528–530 (1997). https://doi.org/10.1007/BF02354999
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DOI: https://doi.org/10.1007/BF02354999