DEREV’YANKO, N. V. Approximation of the Classes $H_p^{Ω}$ of Periodic Functions of Many Variables in the Space $L_p$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 66, n. 5, p. 634–644, 2014. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2165. Acesso em: 14 apr. 2025.