SAAD, ALIA. Post two way stratification analysis for vaccinations in Sudan. International Journal for Innovation Education and Research, Dhaka, Bangladesh, v. 7, n. 12, p. 08–14, 2019. DOI: 10.31686/ijier.vol7.iss12.1689. Disponível em: https://scholarsjournal.net/index.php/ijier/article/view/1689.. Acesso em: 3 jul. 2024.