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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 17, No. 3, pp. 627–639, May–June, 1976.
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Orazov, M.B., Shkalikov, A.A. The n-fold basis property of the characteristic functions of certain regular boundary-value problems. Sib Math J 17, 483–492 (1976). https://doi.org/10.1007/BF00967867
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DOI: https://doi.org/10.1007/BF00967867