1. R.C. Neavel, in: M.L.Gorbaty and K.Ouchi (Eds.), Coal Structure, American Chemical Society, Washington, 1981, Chapter 1.
2. J.B.Howard, in: M.A. Elliott (Ed.), Chemistry of Coal Utilization. Second Supplementary Volume, Wiley, New York, 1981, Chapter 12.
3. Coal Pyrolysis;Gavalas,1982
4. J.C. Jones, in: R.A. Durie (Ed.), The Science of Victorian Brown Coal, Butterworth–Heinemann, Oxford, 1991, Chapter 9.
5. H.H. Schobert, Lignites of North America, Elsevier, Amsterdam, 1995, Chapter 4.