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2. The use of pyrite depressants to reduce the sulfur content of Upper FreepDrt Seam coal;Arnold,1990
3. Standard Test Method for Ash in the Analysis Sample of Coal and Coke from Coal;ASTM,1988
4. Standard Test Method for Forms of Sulfur in Coal;ASTM,1988
5. Hydrolyzed Metal Ions as Pyrite Depressants in Coal Flotation: A Laboratory Study;Baker,1971