KONOHRAI, A. F. Estimates for the approximate characteristics of the classes $B_{p, \theta}^{\Omega}$ of periodic functions of two variables with given majorant of mixed moduli of continuity. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 2, p. 176–186, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2709. Acesso em: 5 dec. 2025.