1. Directive 98/70/EC of the European Parliament and of the Council of 13 October 1998 relating to the quality of petrol and diesel fuels and amending Council Directive 93/12/EEC.
2. Directive 2003/17/EC of the European Parliament and of the Council of 3 March 2003 amending Directive 98/70/EC relating to the quality of petrol and diesel fuels.
3. EN 228:2008 Automotive fuels – unleaded petrol – requirements and test methods.
4. EN 590:2009 Automotive fuels – Diesel – Requirements and test methods.
5. ISO 10576-1:2003 Statistical methods – guidelines for the evaluation of conformity with specified requirements – Part 1: general principles.