GREEN, R.A. WORLD WIDE TRENDS IN MOTOR VEHICLE EMISSION STANDARDS. Clean Air Journal, [S. l.], v. 8, n. 1, p. 15–18, 1990. DOI: 10.17159/caj/1990/8/1.7195. Disponível em: https://cleanairjournal.org.za/article/view/7195. Acesso em: 3 jul. 2024.