VAKARCHUK, M. B.; VAKARCHUK, S. B. On total moduli of continuity for $2\pi$-periodic functions of two variables in the space $L_{2,2}$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 3, p. 300–310, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1697. Acesso em: 5 dec. 2025.