BURNETT, Rosemary J. et al. Progress towards obtaining valid vaccination coverage data in South Africa. South African Journal of Science, [S. l.], v. 115, n. 5/6, 2019. DOI: 10.17159/sajs.2019/6060. Disponível em: https://sajs.co.za/article/view/6060. Acesso em: 18 apr. 2024.