Kushpel , A.K. and Kovalchuk , I.R. (1988) “Estimate of the convergence rate of the interpolation polynomial derivative on the classes of differentiable functions”, Ukrains’kyi Matematychnyi Zhurnal, 40(2), pp. 231–234. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/9122 (Accessed: 6 December 2025).