Shumeiko, A. A. (2000) “On approximation of functions from below by splines of the best approximation with free nodes”, Ukrains’kyi Matematychnyi Zhurnal, 52(4), pp. 512-523. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4440 (Accessed: 18May2024).