PACHULIA, N. L. Points of strong summability of fourier series. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 12, p. 1655–1664, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5576. Acesso em: 17 apr. 2025.