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Translated from Matematicheskie Zametki, Vol. 26, No. 6, pp. 865–873, December, 1979.
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Shterengas, S.S. Riesz-summation of fourier series with respect to the eigenfunctions of an abstract operator. Mathematical Notes of the Academy of Sciences of the USSR 26, 934–938 (1979). https://doi.org/10.1007/BF01142079
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DOI: https://doi.org/10.1007/BF01142079