MotornyiV. P. “On the Problem of Approximation of Functions by Algebraic Polynomials With Regard for the Location of a Point on a Segment”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 60, no. 8, Aug. 2008, pp. 1087–1098, https://umj.imath.kiev.ua/index.php/umj/article/view/3226.