Kofanov, V. A. “Inequalities for Nonperiodic Splines on the Real Axis and Their Derivatives”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 2 (February 25, 2014): 216–225. Accessed April 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2125.