1. Baldwin C, Wilberforce N, Kapur A (2011) Restaurant and food service life cycle assessment and development of a sustainability standard. Int J Life Cycle Assess 16(1):40–49
2. Ecoinvent Centre (2010) ecoinvent data v2.2, ecoinvent reports No. 1-25. Swiss Centre for Life Cycle Inventories, Duebendorf, Switzerland, retrieved from: www.ecoinvent.org .
3. ESU (2015) The ESU database 2015. ESU-services Ltd., retrieved from: www.esu-services.ch/data/database/ .
4. Frischknecht R, Jungbluth N, Althaus H-J, Doka G, Dones R, Heck T, Hellweg S, Hischier R, Nemecek T, Rebitzer G, Spielmann M (2007) Overview and methodology. Swiss Centre for Life Cycle Inventories, Dübendorf, CH, retrieved from: www.ecoinvent.org .
5. Frischknecht R, Steiner R, Jungbluth N (2009) The ecological scarcity method—Eco-Factors 2006: a method for impact assessment in LCA. Federal Office for the Environment FOEN, Zürich und Bern, retrieved from: www.bafu.admin.ch/publikationen/publikation/01031/index.html?lang=en .