SAVAŞ, E. $I_\lambda$-Double statistical convergence of order $α$ in topological groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 68, n. 9, p. 1251–1258, 2016. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1918. Acesso em: 5 dec. 2025.