1. Acoustics of Ducts and Mufflers;Munjal,1987
2. Review of theoretical and experimental aspects of acoustical modeling of engine exhaust systems;Sridhara;J. Acoust. Soc. Am.,1994
3. Control of Air Pollution from Motor Vehicles: Tier 3 Motor Vehicle Emission and Fuel Standards, Proposed Rules, Federal Register, vol. 78, no. 98, May 2013.
4. Regulation (EC) no. 715/2007 of the European Parliament and of the Council of 20 June 2007 on type approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, Off. J. Eur. Union (June) (2007).
5. T.V. Johnson, Review of Vehicular Emissions Trends, SAE Technical Paper 2015-01-0993, 2015.