1.
Sukhorolskyi MA. On the order of local approximation of functions by trigonometric polynomials that are partial sums of averaging operators. Ukr. Mat. Zhurn. [Internet]. 1997May25 [cited 2024May18];49(5):706–714. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5052