KOFANOV, V. A. Bojanov – Naidenov problem for the differentiable functions on the real line and the inequalities of various metrics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 6, p. 786–800, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1476. Acesso em: 5 dec. 2025.