References
G. M.Fichtenholz, Differential and Integralrechnung III. Berlin 1964.
J. Tong, A note on the degree of approximation of Fourier series. Arch. Math.42, 157–158 (1984).
A.Zygmund, Trigonometric Series. 2nd edition, Vol. I, II combined. Cambridge Univ. Press, 1968.
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Tong, J. On a conjecture on the degree of approximation of Fourier series. Arch. Math 45, 252–254 (1985). https://doi.org/10.1007/BF01275577
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DOI: https://doi.org/10.1007/BF01275577