1. ASTM, American Society for Testing Materials: 2001, Standard Specification for Spark-Ignition Engine Fuel, D-4814-01a, November 10, West Conshohocken, PA, USA.
2. Auto/Oil Air Quality Improvement Research Program: 1993, Society of Automotive Engineers, Inc., Volume II. SP-1000, Warrendale, PA.
3. Auto/Oil Air Quality Improvement Research Program: 1995, Society of Automotive Engineers, Inc., Volume III. SP-1117, Warrendale, PA.
4. Bartley, G., Bykowski, B., Welstand, S. and Lax, D.: 1999, ‘Effects of Catalyst Formulation on Vehicle Emissions with Respect to Gasoline Fuel Sulfur Level,’ Society of Automotive Engineers Inc., Technical Paper No.1999-01-3675, Warrendale PA.
5. Bates, S.: 1996, ‘The Attainment of Stage III Gasoline European Emission Limits Utilizing Advanced Catalyst Technology,’ Society of Automotive Engineers Technical Paper No. 961897, Warrendale PA.