StasyukS. A. “Approximating Characteristics of the Analogs of Besov Classes With Logarithmic Smoothness”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 4 (April 25, 2014): 493–499. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2151.