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Translated from Matematicheskie Zametki, Vol. 27, No. 5, pp. 795–812, May, 1980.
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D'yakonov, E.G., Orekhov, M.Y. Minimization of the computational labor in determining the first eigenvalues of differential operators. Mathematical Notes of the Academy of Sciences of the USSR 27, 382–391 (1980). https://doi.org/10.1007/BF01139851
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DOI: https://doi.org/10.1007/BF01139851