1. Our Common Future. Brundtland report of the World Commission on environment and development. Available from: http://worldinbalance.net/pdf/1987-brundtland.pdf [accessed 14.08.10].
2. A/RES/42/187. Resolution of 96th plenary meeting of UN general Assembly of 11 December, 1987. Available from: http://www.un.org/documents/ga/res/42/ares42-187.htm [accessed 14.08.10].
3. Report of the United Nations Conference on Environment and Development. Rio de Janeiro, 3–14 June 1992; Annex I Rio Declaration on Environment and Development. Available from: http://www.un.org/documents/ga/conf151/aconf15126-1annex1.htm [accessed 31.08.10].
4. Report of the World Summit on Sustainable Development. Available from: http://www.un.org/jsummit/html/documents/summit_docs/131302_wssd_report_reissued.pdf [accessed 31.08.10].
5. Crop residues as raw materials for biorefinery systems – a LCA case study;Cherubini;Appl Energy,2010