1.
Serdyuk AS. Approximation of Periodic Functions of High Smoothness by Interpolation Trigonometric Polynomials in the Metric of $L_1$. Ukr. Mat. Zhurn. [Internet]. 2000Jul.25 [cited 2024Oct.6];52(7):994-8. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4501