FEDUNYK, O. V. Linear widths of the classes $B^{\Omega}_{p, \theta}$ of periodic functions of many variables in the space $L_q$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 1, p. 93–104, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3435. Acesso em: 5 dec. 2025.