Trigub, R. M. “On the Approximation of Functions by Polynomials and Entire Functions of Exponential Type”. Ukrains’kyi Matematychnyi Zhurnal 71, no. 2 (February 25, 2019): 293–300. Accessed April 7, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/1439.