V. A. Voitovych, “Estimates for the Approximations of the Classes of Analytic Functions by Interpolation Analogs of the De-La-Vallée–Poussin Sums”, Ukr. Mat. Zhurn., vol. 66, no. 1, pp. 49–62, Jan. 2014, Accessed: Apr. 09, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2110