1. Sulfur Diagenesis in Everglades Peat and Origin of Pyrite in Coal
2. Attar A. (1979) Analytical Methods for Coal and Coal Products, Vol. 111, Sulfur groups in coal and their determination (Academic Press, New York), pp 353–357.
3. Data on the distribution of organic sulfur functional groups in coal;Attar;Preprints for Division of Fuel Chemistry, American Chemical Society,1979
4. Sedimentary pyrite formation
5. Sedimentary pyrite formation: An update