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Translated from Ukrainskii Matematicheskii Zhurnal, Vol.21, No. 6, pp. 846–849, November–December, 1969.
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Rushchitskaya, S.O. On expansion in eigenfunctions of a self-adjoint operator generated by a differential expression and pseudodifferential boundary conditions. Ukr Math J 21, 708–710 (1969). https://doi.org/10.1007/BF01085204
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DOI: https://doi.org/10.1007/BF01085204