Vakarchuk, S. B., and S. I. Zhir. “On Some Problems of Polynomial Approximation of Entire Transcendental Functions”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 54, no. 9, Sept. 2002, pp. 1155-62, https://umj.imath.kiev.ua/index.php/umj/article/view/4155.