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Additional information
Institute of Mathematics, Academy of Sciences of the Ukrainian SSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 5, No. 1, pp. 10–21, January–March, 1971.
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Gorbachuk, M.L. Self-adjoint boundary problems for a second-order differential equation with unbounded operator coefficient. Funct Anal Its Appl 5, 9–18 (1971). https://doi.org/10.1007/BF01075842
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DOI: https://doi.org/10.1007/BF01075842