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The research in this paper was done when the first author stayed as a visiting professor at the University of Milan.
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Dreseler, B., Soardi, P.M. A Cohen type inequality for ultraspherical series. Arch. Math 38, 243–247 (1982). https://doi.org/10.1007/BF01304783
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DOI: https://doi.org/10.1007/BF01304783