SINHA, P.; KUMAR, H. A note on $ {|\overline{N}, p_n; delta|_k} $ summability factors of infinite series. Tamkang Journal of Mathematics, [S. l.], v. 39, n. 3, p. 193–198, 2008. DOI: 10.5556/j.tkjm.39.2008.11. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/11. Acesso em: 7 may. 2024.