SERDYUK, A. S.; STEPANYUK, T. A. Order Estimates for the Best Approximations and Approximations by Fourier Sums in the Classes of Convolutions of Periodic Functions of Low Smoothness in the Uniform Metric. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 66, n. 12, p. 1658–1675, 2014. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2253. Acesso em: 6 dec. 2025.