1.
Romanyuk AS. The best trigonometric approximations and the Kolmogorov diameters of the Besov classes of functions of many variables. Ukr. Mat. Zhurn. [Internet]. 1993May25 [cited 2024Jul.27];45(5):663–675. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5853