[1]
V. A. Kofanov, “On the set of extremal functions in certain Kolmogorov-type inequalities”, Ukr. Mat. Zhurn., vol. 56, no. 8, pp. 1062–1075, Aug. 2004, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3822