SavchukV. V. (2006) “Best linear methods for the approximation of functions of the Bergman class by algebraic polynomials”, Ukrains’kyi Matematychnyi Zhurnal, 58(12), pp. 1674–1685. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3563 (Accessed: 22November2024).