KOFANOV, V. Boyanov–Naidenov problem and the Kolmogorov-type inequalities for functions on the real axis. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 77, n. 1, p. 14–27, 2025. DOI: 10.3842/umzh.v77i1.8538. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8538. Acesso em: 5 dec. 2025.