ELS, C.J. THE CONTROL AND COST OF AIR POLLUTION. Clean Air Journal, [S. l.], v. 6, n. 1, p. 20–23, 1982. DOI: 10.17159/caj/1982/6/1.7370. Disponível em: https://cleanairjournal.org.za/article/view/7370. Acesso em: 29 apr. 2024.