LUGBESOEDELINGBEHEER IN DTE KOPERSMELTBEDRYF. Clean Air Journal, [S. l.], v. 2, n. 4, p. 29–39, 1976. DOI: 10.17159/caj/1976/2/4.7389. Disponível em: https://cleanairjournal.org.za/article/view/7389. Acesso em: 23 nov. 2024.