Maksimenko, S. I., and O. V. Marunkevych. “Topological Stability of the Averagings of Functions”. Ukrains’kyi Matematychnyi Zhurnal 68, no. 5 (May 25, 2016): 625-633. Accessed April 25, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1866.