NELSON, E.R. Technical presentations: to enlighten or obscure. Clean Air Journal, [S. l.], v. 3, n. 2, 1977. DOI: 10.17159/caj/1977/3/2.7239. Disponível em: https://cleanairjournal.org.za/article/view/7239. Acesso em: 14 may. 2024.