Shah, A. N.; shan, G. Y.-.; Gardezi, S. A. R.; fang, W. J.-.; Jian-wei, T. An Experimental Study on Regulated and Unregulated Pollutants from a Spark Ignition Car Fuelled on Liquefied Petroleum Gas and Gasoline: Pollutants from LPG/Gasoline Cars. Pakistan Journal of Scientific & Industrial Research 2010, 53, 223-229.