Journal of Classical Analysis · Volume 21, Issue 1 On the speed of approximation in the classes of ψ̅-integrals 21-02 Pages 9-27 DOI 10.7153/jca-2023-21-02 Downloads Short PDF Full PDF PNG Authors Sİbel Yasemİn Gölbol Uǧur Deǧer Keywords Fourier series Riesz means Woronoi-Nörlund means Kolmogorov-Nikol'skii problem speed of approximation generalized Zygmund sums ψ̅-integrals Subject classes 41A25 41A60 42A10