Bekmaganbetov K, Kervenev K, Toleugazy Y. Order of the trigonometric widths of the Nikol’skii-Besov classes with mixed metric in the metric of anisotropic Lorentz spaces. M [Internet]. 2020 Mar. 30 [cited 2025 Jul. 2];97(1):17-26. Available from: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/325