N. N. Zaderei and P. V. Zaderei, “On the Lebesgue Inequality on Classes of $\bar{\psi}$ -Differentiable Functions”, Ukr. Mat. Zhurn., vol. 65, no. 6, pp. 844–849, Jun. 2013, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2469