Verkalets, N.B., and A.V. Zagorodnyuk. “On Geometric Extension of Polynomials on Banach Spaces”. Carpathian Mathematical Publications 5, no. 2 (December 30, 2013): 196–198. Accessed April 19, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/1309.