1. U.S Bureau of Mines Rep Invest No. 6440;Abernethy,1964
2. Graphite ribbon from graphite fiber;Anderson;Carbon,1984
3. Effecient burning of coal;Armson,1986
4. Prepr paper, American Chemical Society;Attar;Division of fuel chemistry,1978
5. Chemistry, thermodynamics and kinetics of reactions of sulphur in coal-gas reactions: A review