SERDYUK, A. S.; SOKOLENKO, I. V. Approximation by Fourier sums in classes of differentiable functions with high exponents of smoothness. Methods of Functional Analysis and Topology, [S. l.], v. 25, n. 4, p. 381–387, 2019. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/740. Acesso em: 15 dec. 2025.