1. Augustine C, Denholm P, Heath G, Mai T, Tegen S, Young K. Renewable electricity futures study. Volume 2: Renewable electricity generation and storage technologies—Chapter 7. Geothermal energy technologies. Golden, CO: National Renewable Energy Laboratory (NREL); 2012.
2. Axelsson G, Stefánsson V. Sustainable management of geothermal resources. In: International Geothermal Conference. Reykjavik, Iceland, Sept; 2003.
3. Axelsson G, Stefánsson V, Björnsson G, Liu J. Sustainable management of geothermal resources and utilization for 100–300 years. In: Proceedings of the world geothermal congress, Antalya, Turkey, 24–29 April 2005.
4. Axelsson G, Bromley C, Mongillo M, Rybach L. The sustainability task of the international energy agency’s geothermal implementing agreement. In: Proceedings of the world geothermal congress, Bali, Indonesia, 25–29 April 2010.
5. Barbier E. Geothermal energy technology and current status—an overview. Renew Sustain Energy Rev. 2002;6(1):3–65.