1.
Serdyuk AS, Stepanets OI. Approximation by fourier sums and best approximations on classes of analytic functions. Ukr. Mat. Zhurn. [Internet]. 2000Mar.25 [cited 2024Jul.27];52(3):375-9. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4428