Konohrai AF, Stasyuk SA. Best <i>M</i>-term trigonometric approximations of the classes of periodic functions of many variables in the space <i>L<sub>q</sub&gt;. Ukr. Mat. Zhurn. [Internet]. 2008Sep.25 [cited 2024Apr.23];60(9):1196 -. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3237