[1]
O. I. Stepanets, “Approximation of $\bar {\psi} - \text{Integrals}$ of periodic functions by Fourier sums (small smoothness). IIof periodic functions by Fourier sums (small smoothness). II”, Ukr. Mat. Zhurn., vol. 50, no. 3, pp. 388–400, Mar. 1998, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4938