MyronyukV. V. “Trigonometric Approximations and Kolmogorov Widths of Anisotropic Besov Classes of Periodic Functions of Several Variables”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 8 (August 25, 2014): 1117–1132. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2203.