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Translated from Matematicheskie Zametki Vol. 1, No. 3, pp. 365–678, March, 1967.
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Kostyuchenko, A.G. Some spectral properties of differential operators. Mathematical Notes of the Academy of Sciences of the USSR 1, 242–250 (1967). https://doi.org/10.1007/BF01098892
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DOI: https://doi.org/10.1007/BF01098892