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Translated from Matematicheskie Zametki, Vol. 1, No. 5, pp. 575–582, May, 1967.
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Finozhenok, G.N. Nature of the spectrum of the first boundary value problem for higher order equations in infinite domains. Mathematical Notes of the Academy of Sciences of the USSR 1, 381–385 (1967). https://doi.org/10.1007/BF01094076
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DOI: https://doi.org/10.1007/BF01094076