GAVRILYUK, V. T. On saturation classes of linear methods of the Fourier series summation . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 5, p. 569–576, 1988. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8804. Acesso em: 5 dec. 2025.