1. Sur la dérivation des séries de Fourier;Zygmund;Bull. de l'Acad. Polonaise,1924
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3. On the summability of Fourier series;Hardy,1913
4. On the convergence factor of a Fourier series;Mohanty,1967
5. Notes on Fourier Analysis (XXXIX);Sunouchi;Tôhoku Math. J.,1951