1. China biggest CO2 emitter last year: Dutch agency;AFP,2009
2. European Council. Directive 2009/28/EC of the European Parliament and of the Council of 23 April 2009 on the promotion of the use of energy from renewable sources and amending and subsequently repealing Directives 2001/77/EC and 2003/30/EC. Retrieved on October 21, 2009 from http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2009:140:0016:0062:EN:PDF.
3. Comparative study on energy sustainability of biofuel production chains;Cocco;Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy,2007
4. Comparing annual and perennial energy cropping systems with different management intensities;Boehmel;Agricultural Systems,2008
5. Biofuel production potentials in Europe: sustainable use of cultivated land and pastures. Part I: Land productivity potentials;Fischer;Biomass and Bioenergy,2010