1. Yacobucci BD, 2008. A low carbon fuel standard: state and federal legislation and regulations. Congressional Research Service, R40078, Washington DC, 15 p.
2. EU Commission, 2008. Directive of the European Parliament and of the council on the promotion of the use of energy from renewable sources. Brussels, 61 p.
3. Fehrenbach H, Giegerich J, Reinhardt G, Schmitz J, Sayer U, Gretz M, et al. Criteria for a sustainable use of bioenergy on a global scale. Federal Environment Agency Germany, prepared by the Institute for energy and Environmental research (IFEU), Heidelberg, 245 p.
4. Developments in international bioenergy trade;Junginger;Biomass and Bioenergy,2008
5. A participatory systems approach to modeling social, economic, and ecological components of bioenergy;Buchholz;Energy Policy,2007