Serdyuk, A.S. (2002) “Approximation of Periodic Analytic Functions by Interpolation Trigonometric Polynomials in the Metric of the Space $L$”,
Ukrains’kyi Matematychnyi Zhurnal, 54(5), pp. 692–699. Available at:
https://umj.imath.kiev.ua/index.php/umj/article/view/4108 (Accessed: 14 April 2025).