SERDYUK, A.S.; HRABOVA, U.Z. Order estimates of the uniform approximations by Zygmund sums on the classes of convolutions of periodic functions. Carpathian Mathematical Publications, [S. l.], v. 13, n. 1, p. 68–80, 2021. DOI: 10.15330/cmp.13.1.68-80. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/4404. Acesso em: 2 may. 2024.