STASYUK, S. A.; FEDUNYK, O. V. Approximation characteristics of the classes $B_{p,θ}^{Ω}$ of periodic functions of many variables. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 5, p. 692–704, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3486. Acesso em: 5 dec. 2025.