MotornayaO. V., & MotornyiV. P. (2000). On asymptotically exact estimates for the approximation of certain classes of functions by algebraic polynomials. Ukrains’kyi Matematychnyi Zhurnal, 52(1), 85-99. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4399