Geodesic
Lebesgue constants of linear methods of summability for Fourier
Izvestiya. Mathematics, Tome 1 (1967) no. 5, pp. 1081-1097 
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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     title = {Lebesgue constants of linear methods of summability for {Fourier}},
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Voir la notice de l'article provenant de la source Math-Net.Ru

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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