Maksymenkova , Yu. A., and Michaylova Т. F. “On One Property of the Modulus of Continuity for Periodic Functions of Higher Orders ”. Ukrains’kyi Matematychnyi Zhurnal 74, no. 8 (October 4, 2022): 1149 - 1152. Accessed November 29, 2022. https://umj.imath.kiev.ua/index.php/umj/article/view/7217.