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Baku. Translated fromSibirskiî Matematicheskiî Zhurnal, Vol. 41, No. 3, pp. 489–497, May–June, 2000.
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Aliev, B.A., Aliev, I.V. Completeness of the system of root functions of boundary value problems for elliptic equations with Bitsadze-Samarskiî type boundary conditions. Sib Math J 41, 397–404 (2000). https://doi.org/10.1007/BF02674097
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DOI: https://doi.org/10.1007/BF02674097