BabenkoV. F., KofanovV. A., and PichugovS. A. “On Additive Inequalities for Intermediate Derivatives of Functions Given on a Finite Interval”. Ukrains’kyi Matematychnyi Zhurnal 49, no. 5 (May 25, 1997): 619–628. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5042.