SerdyukA. S. “Approximation of Classes of Analytic Functions by Fourier Sums in Uniform Metric”. Ukrains’kyi Matematychnyi Zhurnal 57, no. 8 (August 25, 2005): 1079 -. Accessed November 25, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3666.