Literature cited
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L. Leindler, Uber die de la Vallee-Poussinschen Mittel allgemeiner Orthogonalreihen, Publ. math. Debrecen,10, 274–282 (1963).
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Additional information
Translated from Matematicheskie Zametki, Vol. 2, No. 2, pp. 175–186, August, 1967.
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Storozhenko, é.A. Rate of approximation of functions by de la Vallee-Poussin means of their orthogonal expansions. Mathematical Notes of the Academy of Sciences of the USSR 2, 588–596 (1967). https://doi.org/10.1007/BF01094251
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DOI: https://doi.org/10.1007/BF01094251