MotornyiV. P. “On One-Sided Approximation of Functions With Regard for the Location of a Point on an Interval”. Ukrains’kyi Matematychnyi Zhurnal 54, no. 5 (May 25, 2002): 666-669. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4105.