ALASHWL, DR.Aziza Ali. Epidemiological nodal issues (Covid-19) as a model. Humanities and Educational Sciences Journal, [S. l.], n. 24, p. 79–102, 2022. DOI: 10.55074/hesj.v0i24.504. Disponível em: https://hesj.org/ojs/index.php/hesj/article/view/504. Acesso em: 23 oct. 2026.