Serdyuk, A. S. (2004) “Approximation of infinitely differentiable periodic functions by interpolation trigonometric polynomials”, Ukrains’kyi Matematychnyi Zhurnal, 56(4), pp. 495–505. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3771 (Accessed: 12May2024).