1. ecoinvent Centre (2006) ecoinvent data v1.3, final ecoinvent reports no. 1–16. ISBN 3-905594-38-2. Swiss Centre for Life Cycle Inventories, Duebendorf, Switzerland. Available at http://www.ecoinvent.org
2. Goedkoop M, Spriensma R (2000) The Eco-Indicator 99: a damage oriented method for life cycle impact assessment. PRé Consultants, Amersfoort, The Netherlands. Available at http://www.pre.nl/eco-indicator99/
3. NEEDS (2009) NEEDS—new energy externalities developments for sustainability. Available at www.needs-project.org . Accessed on June 29, 2009