Serdyuk AS. On the best approximation of classes of convolutions of periodic functions by trigonometric polynomials. Ukr. Mat. Zhurn. [Internet]. 1995 Sep. 25 [cited 2025 Dec. 5];47(9):1261–1265. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5526