ALVAREZ, E.; RAPHAEL, R. On Regrouping Convergent Series into Absolutely Convergent Series. Minnesota Journal of Undergraduate Mathematics, Minneapolis, MN, v. 4, n. 1, 2021. Disponível em: https://pubs.lib.umn.edu/index.php/mjum/article/view/4158. Acesso em: 2 may. 2024.