VAN TIENHOVEN, M. NACA and UJ unite. Clean Air Journal, [S. l.], v. 17, n. 2, 2009. DOI: 10.17159/caj/2009/17/2.7172. Disponível em: https://cleanairjournal.org.za/article/view/7172. Acesso em: 4 oct. 2022.