Geodesic
Lebesgue constants of linear methods of summability for Fourier
Izvestiya. Mathematics , Tome 1 (1967) no. 5, pp. 1081-1097.

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A new condition is established for the boundedness of the Lebesgue constants of linear methods of summability for Fourier series. In many cases this condition is more precise than previously known conditions. 
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G. A. Fomin. Lebesgue constants of linear methods of summability for Fourier. Izvestiya. Mathematics , Tome 1 (1967) no. 5, pp. 1081-1097. http://geodesic.mathdoc.fr/item/IM2_1967_1_5_a9/

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