1. D. W. McKee, “Chemistry and Physics of Carbon” v. 16, P. L. Walker, Jr. and P. A. Thrower, eds., Marcel Dekker, NY (1981) p. 1.
2. S. A. Qader, “Natural Gas Substitutes from Coal and Oil”, Coal Science and Technology 8, L. Anderson, ed., Elsevier, (1985), Ch. 4, p. 150.
3. NATO ASI Series E;RTK Baker,1986
4. J.R. Pullen, “Catalytic Coal Gasification” IEA Rep. ICTIS/TR26, IEA Coal Research, London (1984).
5. NATO ASI Series E;F Kapteijn,1986