BRONO, A. M.; ALI, A. G. kachalla. I_2-Statistical Limit Superior and I_2–Statistical Limit Inferior for Double Sequences. Journal of the Nigerian Mathematical Society, [S. l.], v. 39, n. 3, p. 323–333, 2021. Disponível em: https://ojs.ictp.it/jnms/index.php/jnms/article/view/323. Acesso em: 12 apr. 2021.