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Translated from Matematicheskie Zametki, Vol. 40, No. 5, pp. 608–620, November, 1986.
The author thanks V. A. II'in for attention.
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Kerimov, N.B. Some properties of the eigenfunctions and associated functions of an ordinary differential operator of fourth order. Mathematical Notes of the Academy of Sciences of the USSR 40, 847–854 (1986). https://doi.org/10.1007/BF01159702
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DOI: https://doi.org/10.1007/BF01159702