WESSELS, J.W. Die verwydering van stofas uit die skoorstene van die SASOL kragstasie. Clean Air Journal, [S. l.], v. 1, n. 04, 1973. DOI: 10.17159/caj/1973/1/04.7222. Disponível em: https://cleanairjournal.org.za/article/view/7222. Acesso em: 19 may. 2024.