[1]
A. F. Konohrai and S. A. Stasyuk, “Best M-term trigonometric approximations of the classes of periodic functions of many variables in the space Lq”, Ukr. Mat. Zhurn., vol. 60, no. 9, pp. 1196 – 1214, Sep. 2008, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3237