TERBLANCHE, P; OPPEMAN, L; NEL, R; POLS, A. Prevalence of respiratory illnesses in different regions of South Africa. Clean Air Journal, [S. l.], v. 8, n. 8, 1993. DOI: 10.17159/caj/1993/8/8.7317. Disponível em: https://cleanairjournal.org.za/article/view/7317. Acesso em: 28 apr. 2024.