PATI, T. The Non-Absolute Summability of Fourier Series by a Norlund Method. The Journal of the Indian Mathematical Society, [S. l.], v. 25, n. 3-4, p. 197–214, 1961. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/22059. Acesso em: 5 may. 2024.