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The author is grateful to Professor A. A. Shkalikov for his constant attention to the work and valuable remarks.
Translated fromMatematicheskie Zametki, Vol. 58, No. 5, pp. 790–793, November, 1995.
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Sheipak, I. The eigenfunction system of a hydrodynamical problem is a Riesz basis. Math Notes 58, 1238–1241 (1995). https://doi.org/10.1007/BF02305010
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DOI: https://doi.org/10.1007/BF02305010