SerdyukA. S., & StepanetsO. I. (2000). Approximation of Periodic Analytic Functions by Interpolation Trigonometric Polynomials. Ukrains’kyi Matematychnyi Zhurnal, 52(12), 1689-1701. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4572