[1] R. Bojanic: An estimate of the rate of convergence for Fourier series of functions of bounded variation. Publications de L'Institut Mathématique, Nouvelle série, 26 (40), 1979, p. 57-60. MR 0572330 | Zbl 0451.42004

[2] C. K. Chui A. S. B. Holland: On the order of approximation by Euler and Taylor means. Journal of Аpproximation Theory, 39 (1983), 24-38. MR 0713359

[3] K. Knopp: Theorie und Аnwendung deг unendlichen Reihen, II. Berlin 1931.

[4] G. H. Hardy: Divergent Ѕeries. Oxford 1949. MR 0030620