1. G. Das, A. Nath and B. K. Ray,
An estimate of the rate of convergence of Fourier series in the generalized Hölder metric,
Analysis and Applications (Ujjain 1999),
Narosa, New Delhi (2002), 43–60.
2. C. de la Vallée Poussin,
Sur la meilleure approximation des fonctions d’une variable réelle par des expressions d’ordre donné,
C. R. Acad. Sci. Paris 166 (1918), 799–802.
3. L. Leindler,
Generalizations of Prössdorf’s theorems,
Studia Sci. Math. Hungar. 14 (1979), no. 4, 431–439.
4. S. M. Mazhar,
Approximation by the partial sums of Fourier series,
Analysis 11 (1991), no. 2–3, 149–154.
5. S. M. Mazhar and V. Totik,
Approximation of continuous functions by T-means of Fourier series,
J. Approx. Theory 60 (1990), no. 2, 174–182.