1. Directive 2009/30/EC of the European Parliament, revised Fuel Quality Directive, April 2009.
2. Biofuels in the European Context, Report of European Commission, Joint Research Center (JCR), Institute for Reference Materials and Measurements, Geel, Belgium, 2008.
3. White Paper on Internationally Compatible Biofuel Standards, Tripartite Task Force Brazil, European Union and United States of America, US National Institute of Standards and Technology (NIST), December 31, 2007.
4. Biofuels for Transport: Global Potential and Implications for Sustainable Energy and Agriculture, Worldwatch Institute, Earthscan, London, 2008.
5. Density Measurements of Fluids and Their Mixtures at High Pressure