ANNEGARN, H.J; SCORDIE, Y. An air quality management strategy for the Vaal Triangle - Part 1. Clean Air Journal, [S. l.], v. 9, n. 7, 1997. DOI: 10.17159/caj/1997/9/7.7325. Disponível em: https://cleanairjournal.org.za/article/view/7325. Acesso em: 27 apr. 2024.