Babenko, V. F. “Investigations of Dnepropetrovsk Mathematicians Related to Inequalities for Derivatives of Periodic Functions and Their Applications”. Ukrains’kyi Matematychnyi Zhurnal 52, no. 1 (January 25, 2000): 9–29. Accessed April 7, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4392.