1. E. Raask, Mineral Impurities in Coal Combustion, Behaviour Problems and Remedial Measures, Hemisphere Publishing, Bristol, PA, 1985.
2. Investigation of the transformations of pyrite in a drop-tube furnace
3. I.G. Wright, ASM Metals Handbook, Vol. 13 (Corrosion), ASM International, Materials Park, OH, 1992.