ZadereiN. N., and ZadereiP. V. “On the Lebesgue Inequality on Classes of $\bar{\psi}$ -Differentiable Functions”. Ukrains’kyi Matematychnyi Zhurnal 65, no. 6 (June 25, 2013): 844–849. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2469.