KOFANOV, V. A. On the set of extremal functions in certain Kolmogorov-type inequalities. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 8, p. 1062–1075, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3822. Acesso em: 16 feb. 2026.