WELLS, R.B. Trace elements as air pollutants. Clean Air Journal, [S. l.], v. 3, n. 2, 1977. DOI: 10.17159/caj/1977/3/2.7243. Disponível em: https://cleanairjournal.org.za/article/view/7243. Acesso em: 1 apr. 2025.