E-J Summability of Orthogonal Series. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 13, n. 3, p. 390–402, 2020. DOI: 10.29020/nybg.ejpam.v13i3.3687. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/3687.. Acesso em: 28 apr. 2024.