1. Political, economic and environmental impacts of biofuels: a review;Demirbas;Appl Energy,2009
2. IEA. Key world energy statistics. Available at: http://www.iea.org/textbase/nppdf/free/2009/key_stats_2009.pdf.
3. Biofuels 2020, a policy driven logistics and business challenge. Reseach and innovation, position paper 02, 2010. Available at: http://www.dnv.com/binaries/Biofuels%202020%20position%20paper_tcm4-434417.pdfh.
4. Carbon disclosure project transport report. Analysis based on CDP 2009 data. Available at: http://www.att.com/Common/about_us/files/pdf/Telepresence/CDP_Telepresence_Report_Final.pdf.
5. Life cycle assessment and life cycle costing of bioethanol from sugarcane in Brazil;Luo;Renew Sust Energy Rev,2009