RADCHENKO, O. Ya.; YANCHENKO, S. Ya. Approximative characteristics of the Nikol’skii – Besov classes of functions $S_{1, θ}^r B(\mathbb{R}^d)$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 10, p. 1405–1421, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1523. Acesso em: 5 dec. 2025.