Fedunyk OV. Linear widths of the classes $B^{\Omega}_{p, \theta}$ of periodic functions of many variables in the space $L_q$. Ukr. Mat. Zhurn. [Internet]. 2006Jan.25 [cited 2024Nov.22];58(1):93–104. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3435