KofanovV. A. “Sharp Upper Bounds of Norms of Functions and Their Derivatives on Classes of Functions With Given Comparison Function”. Ukrains’kyi Matematychnyi Zhurnal 63, no. 7 (July 25, 2011): 969-984. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2778.