Mytrofanov, M.A., and A.V. Ravsky. “A Note on Approximation of Continuous Functions on Normed Spaces”. Carpathian Mathematical Publications 12, no. 1 (June 12, 2020): 107–110. Accessed December 17, 2025. https://journals.pnu.edu.ua/index.php/cmp/article/view/3890.