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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 23, No. 1, pp. 3–14, January–February, 1971.
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Gorbachuk, V.I., Gorbachuk, M.L. Problems of the spectral theory of the second order linear differential equation with unbounded operator coefficients. Ukr Math J 23, 1–11 (1971). https://doi.org/10.1007/BF01086580
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DOI: https://doi.org/10.1007/BF01086580