Babich, Yu. P., and T. F. Mikhailova. “Fine-Grained Evaluations of the Best Estimates for Smooth Functions in $C_{2\pi}$ in Terms of Linear Combinations of Modules of Continuity of Their Derivatives”. Ukrains’kyi Matematychnyi Zhurnal 74, no. 4 (May 23, 2022): 569 - 572. Accessed April 18, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/7124.