A. S. Serdyuk, “Approximation by interpolation trigonometric polynomials on classes of periodic analytic functions”, Ukr. Mat. Zhurn., vol. 64, no. 5, pp. 698–712, May 2012, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2609