1. World Energy Council. World Energy Resources, 2013 Survey. London, UK: World Energy Council.
2. Aghalayam P. Underground coal gasification: a clean coal technology. In: Handbook on combustion. Wiley-VCH books; 2010. p. 257–75.
3. Wellborn TA. Linear burning rates of Texas Lignites [Master’s thesis]. Austin, TX: University of Texas at Austin; 1981.
4. Poon SSK. The combustion rates of Texas Lignite Cores [Master’s thesis]. Austin, TX: University of Texas at Austin; 1985.
5. Forrester RC. Two-dimensional studies of coal pyrolyiss preliminary results. In: Proc. 5th annu. underground coal conversion symp. Department of Energy: Washington, DC; 1979. p. 402–10.