1. Biodiesel production and quality;National Biodiesel Board,2007
2. Biotech breakthrough could end biodiesel’s glycerin glut;Boyd,2007
3. World market impacts of high biofuel use in the European union;Carriquiry,2010
4. Global biodiesel market Dallas, TX,2010
5. The future of glycerol: new uses for a versatile raw material;Pagliaro,2008