1. Herman, D. R. (1981). The rate of pyrolysis of ponderosa pine. MS Thesis, Colorado School of Mines.
2. Johnston, J. L. (1979). Kinetics of Coal Gasification. Wiley, New York.
3. Lowry, H. H. (Ed.) (1963). Chemistry of Coal Utilization. Wiley, New York, Chapter 20.
4. Menster, M. and Ergun, S. (1973). US Bur. Mines Bull. (644).