Kostich MV. On the approximation of functions from Weyl-Nagy classes by Zygmund sums in the $L_q$ metric. Ukr. Mat. Zhurn. [Internet]. 1999Feb.25 [cited 2024Nov.28];51(2):268-70. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4608