Shkapa, V. V. (2015). Approximating Characteristics of the Classes $L_{β,p}^{ψ}$ of Periodic Functions in the Space $L_q$. Ukrains’kyi Matematychnyi Zhurnal, 67(8), 1139-1150. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/2052