Pichugov, S. A. (2012) “Lower bounds for the deviations of the best linear methods of approximation of continuous functions by trigonometric polynomials”, Ukrains’kyi Matematychnyi Zhurnal, 64(5), pp. 662-673. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2606 (Accessed: 25April2024).