Vakarchuk, S. B., and S. I. Zhir. “On the Best Polynomial Approximations of Entire Transcendental Functions of Many Complex Variables in Some Banach Spaces”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 12 (December 25, 2014): 1598–1614. Accessed April 25, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2249.