[1]
S. A. Stasyuk, “Best approximation of periodic functions of several variables from the classes $MB^{\omega}_{p,\theta}$”, Ukr. Mat. Zhurn., vol. 64, no. 1, pp. 140–144, Jan. 2012, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2561