1. Best Practices in Underground Coal Gasification;Burton,2004
2. Carbon energy limited “Underground Coal Gasification Syn Gas Production and Power Generation Bloodwood Creek Project” Initial Advice Statement, December, 2009.
3. Clean coal technologies link, 〈www.lifepowerandfuels.com/clean-energy-technologies/underground-coal-gasifictaion.html〉.
4. Groundwater pollution from underground coal gasification;Liu;J China Univ Min Technol,2007
5. GasTech, Inc. Viability of underground coal gasification in the “Deep Coals” of the powder river basin, Wyoming. Prepared for the Wyoming business council, 〈http://www.wyomingbusiness.org/program/ucg-viability-analysis-powder-river-/1169〉; 2007 [accessed 19.09.2011].