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This research was partially supported by the Hungarian National Foundation for Scientific Research under Grant # T 016 393.
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Leindler, L., Леиндлер, Л. Embedding results pertaining to strong approximation of fourier series. I. Anal Math 23, 99–114 (1997). https://doi.org/10.1007/BF02789832
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DOI: https://doi.org/10.1007/BF02789832