M. ALI, Salah. r-convergence in metric space. Journal of Al-Qadisiyah for Computer Science and Mathematics, [S. l.], v. 2, n. 2, p. 62–68, 2017. Disponível em: https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/223. Acesso em: 20 sep. 2024.