Romanyuk AS. Entropy numbers and the widths of the classes $B_{p,θ}^r$ of periodic functionsof many variables. Ukr. Mat. Zhurn. [Internet]. 2016Oct.25 [cited 2024Nov.21];68(10):1403-17. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/1928