HAMEED, R.; BHATTI, N. A.; NADEEM, O.; HAYDAR, S.; KHAN, M. A. Comparative Analysis of Emissions from Motor Vehicles Using LPG, CNG and Petrol as Fuel in Lahore. Journal of the Pakistan Institute of Chemical Engineers, [S. l.], v. 41, n. 1, p. 59–66, 2013. Disponível em: http://piche.org.pk/journal/index.php/jpiche/article/view/114. Acesso em: 20 apr. 2024.