SHKAPA, V. V. Approximating Characteristics of the Classes $L_{β,p}^{ψ}$ of Periodic Functions in the Space $L_q$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 67, n. 8, p. 1139–1150, 2015. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2052. Acesso em: 5 dec. 2025.