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Translated from Ukrainskii Matematicheskii Zhurnal, No. 3, pp. 291–305, May–June, 1972.
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Gorbachuk, V.I., Gorbachuk, M.L. Classes of boundary-value problems for the sturm — Liouville equation with an operator potential. Ukr Math J 24, 241–250 (1972). https://doi.org/10.1007/BF01086235
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DOI: https://doi.org/10.1007/BF01086235