1. Åhman, M., Nilsson, L.J., 2007. Path dependency and the future of advanced vehicles and biofuels. Utilities Policy, accepted for publication.
2. Bach, H., 2006. Personal communication. Federal Ministry of Agriculture, Forestry, Environment and Water—Management Division V/5—Transport, Mobility, Human Settlement and Noise (Government official), 15 March 2006.
3. Börjesson, P., 2006. Energibalans för bioetanol—en kunskapsöversikt (Energy balance for bioethanol—a knowledge overview). Report No. 59, Environmental and Energy Systems Studies, Lund University (in Swedish).
4. Bustos, M., 2006. Personal communication. Spanish Renewable Energy Association (APPA)—Biofuels expert, 6 June 2006.
5. CEU (Council of the European Union), 2002a. Outcome of the Proceedings of the Working Party on Energy, Brussels, 22 February 2002.