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Translated from Ukrainskii Matemicheskii Zhurnal, Vol. 24, No. 6, pp. 726–734, November–December, 1972.
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Gorbachuk, V.I., Gorbachuk, M.L. The spectrum of self-adjoint extensions of the minimal operator generated by a Sturm-Liouville equation with operator potential. Ukr Math J 24, 582–588 (1972). https://doi.org/10.1007/BF01085407
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DOI: https://doi.org/10.1007/BF01085407