Zenski, W.odzimierz et Szal, Bogdan, Approximation of integrable functions by general linear operators of their fourier series, Acta mathematica Sinica. English series (Print) , 28(7), 2012, pp. 1119-1134
The pointwise estimates of the deviation T n,A,B f(·).f(·) in terms of moduli of continuity .w·f and w·f there are proved. Analogical results on norm approximation with remarks and corollaries are also given. In the results there are used the essentially weaker conditions than these in [Mittal, M. L.: J. Math. Anal. Appl., 220, 434.450 (1998) Theorem 1, p. 437].