1. Kristiansen, A. Understanding coal gasification. IEA Coal Research Report IEACR/86, 1996.
2. Tabberer, R. Gasification of solid and liquid fuels. DTI Cleaner Coal Technology Programme Report R161, 1998.
3. Annual Conference Reports, Gasification Technologies Council, the most recent being 2001.()
4. European Gasification Conference Reports, Institution of Chemical Engineers, the most recent being April 2002 ().