Entropy numbers and Kolmogorov widths of Nikol’skii-Besov classes of periodic functions of two variables in the space $L_{\infty}$. ЗПІМ [Internet]. 2015 Jul. 14 [cited 2026 Sep. 9];12(4):235-52. Available from: https://trim.imath.kiev.ua/index.php/trim/article/view/298