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B. S. Kashin and A. A. Saakyan, Orthogonal Series [in Russian], Nauka, Moscow (1984).
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Translated from Matematicheskie Zametki, Vol. 51, No. 5, pp. 149–150, May, 1992.
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Krantsberg, A.S. On a generalization of the bessel inequality. Math Notes 51, 527–528 (1992). https://doi.org/10.1007/BF01262190
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DOI: https://doi.org/10.1007/BF01262190