1. Particle size effect for metal pollution analysis of atmospherically deposited dust;Al-Rajhi;Atmospheric Environment,1996
2. Environmental Geochemistry of Sulfide Oxidation. American Chemical Society Book;Alpers,1994
3. ASTM D2492–02, Standard Test Method for Forms of Sulfur in Coal (www.astm.org).
4. ASTM D3172-13, Standard Practice for Proximate Analysis of Coal and Coke (www.astm.org).
5. ASTM D4239-14e2, Standard Test Method for Sulfur in the Analysis Sample of Coal and Coke Using High-Temperature Tube Furnace Combustion (www.astm.org).