Skorokhodov, D. S. “Landau-Kolmogorov Problem for a Class of Functions Absolutely Monotone on a Finite Interval”. Ukrains’kyi Matematychnyi Zhurnal 63, no. 4 (April 25, 2011): 531-548. Accessed May 3, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2739.