Hnatyuk, Yu. V. “Best Uniform Approximation of a Family of Functions Continuous on a Compact Set”.
Ukrains’kyi Matematychnyi Zhurnal 54, no. 11 (November 25, 2002): 1574–1580. Accessed April 7, 2025.
https://umj.imath.kiev.ua/index.php/umj/article/view/4194.