Radchenko, O.Y. and Yanchenko, S.Y. 2019. Approximative characteristics of the Nikol’skii – Besov classes of functions $S_{1, θ}^r B(\mathbb{R}^d)$. Ukrains’kyi Matematychnyi Zhurnal. 71, 10 (Oct. 2019), 1405-1421.