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Translated fromMatematicheskie Zametki, Vol. 61, No. 6, pp. 946–949, June, 1997.
Translated by A. I. Shtern
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Lokshin, A.A. On the concavity of the surface of eigenvalues. Math Notes 61, 789–792 (1997). https://doi.org/10.1007/BF02361224
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DOI: https://doi.org/10.1007/BF02361224