LOUW, C.W; ODENDAAL, P.J. Ons atmosfeer en die kwesbaarheid daarvan. Clean Air Journal, [S. l.], v. 7, n. 8, 2019. DOI: 10.17159/caj/1989/7/8.7296. Disponível em: https://cleanairjournal.org.za/article/view/7296. Acesso em: 10 may. 2024.