GAVRILYUK, V. T. Asymptotic estimates of approximation of continuous periodic functions by the Fourier sums . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 42, n. 6, p. 747–755, 1990. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8830. Acesso em: 11 apr. 2025.