ANNEGARN, H.J; SCORGIE, Y. An air quality management strategy for the Vaal Triangle - Part 2. Clean Air Journal, [S. l.], v. 9, n. 8, 1997. DOI: 10.17159/caj/1997/9/8.7327. Disponível em: https://cleanairjournal.org.za/article/view/7327. Acesso em: 2 may. 2024.