On δ-Sequential Spaces. Journal of Pure & Applied Sciences , [S. l.], v. 21, n. 1, p. 87–93, 2022. DOI: 10.51984/jopas.v21i1.1582. Disponível em: https://www.sebhau.edu.ly/journal/jopas/article/view/1582. Acesso em: 30 jan. 2026.