WALKER, N.P. The measurement of nitrogen dioxide by simple diffusion tubes. Clean Air Journal, [S. l.], v. 6, n. 8, 1985. DOI: 10.17159/caj/1985/6/8.7279. Disponível em: https://cleanairjournal.org.za/article/view/7279. Acesso em: 5 may. 2024.