1. Aerothermal Group. (2015). http://www.aerothermalgroup.com/latestnews.html . Accessed 7 Dec 2015.
2. Amyris. (2015). Sustainability. https://amyris.com/innovation/sustainability/ . Accessed 01 Dec 2015.
3. Anellotech Inc. (2015). New technology to produce clean, renewable chemicals currently made from petroleum. http://anellotech.com/technology . Accessed 3 Dec 2015.
4. Ariunbaatar, J., Panico, A., Esposito, G., Pirozzi, F., & Lens, P. (2014). Pretreatment methods to enhance anaerobic digestion of organic solid waste. Applied Energy, 123, 143–156.
5. Ausilio B., Göran B., Martin, J., Marc L., & François V. (2009). Bioenergy- A sustainable and reliable energy resource; A review of status and prospects (Vol. 6). IEA Bioenergy: ExCo.