Voitovych, V. A. (2014). Estimates for the Approximations of the Classes of Analytic Functions by Interpolation Analogs of the De-La-Vallée–Poussin Sums. Ukrains’kyi Matematychnyi Zhurnal, 66(1), 49–62. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/2110