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Translated from Sibirskii Matematicheskii, Vol. 37, No. 6, pp. 1397–1406, November–December, 1996.
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Fayazov, K.S. Boundary value problems for a second-order differential equation with selfadjoint operator coefficients. Sib Math J 37, 1228–1236 (1996). https://doi.org/10.1007/BF02106747
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DOI: https://doi.org/10.1007/BF02106747