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Additional information
Mathematics Institute, Academy of Sciences of the Ukrainian SSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 7, No. 1, pp. 68–69, January–March, 1973.
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Gorbachuk, M.L. Completeness of the system of eigenfunctions and associated functions of a nonself-adjoint boundary value problem for a differential-operator equation of second order. Funct Anal Its Appl 7, 58–59 (1973). https://doi.org/10.1007/BF01075652
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DOI: https://doi.org/10.1007/BF01075652