Myronyuk VV. Trigonometric Approximations and Kolmogorov Widths of Anisotropic Besov Classes of Periodic Functions of Several Variables. Ukr. Mat. Zhurn. [Internet]. 2014Aug.25 [cited 2024Nov.23];66(8):1117–1132. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2203