Babenko, Yu. V. “Pointwise Inequalities of Landau–Kolmogorov Type for Functions Defined on a Finite Segment”. Ukrains’kyi Matematychnyi Zhurnal 53, no. 2 (February 25, 2001): 238-243. Accessed May 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4239.