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2. Coal Properties Dictate Coal Flotation Strategies;Aplan;Mining Engineering,1993
3. The Hydrophobicity of Coal Macerals;Arnold;Fuel,1989
4. ASTM D409 1991. Standard Method of Test for Grindability of Coal by Hardgrove Machine Method. Annual Book of ASTM Standards. Section 05.05. American Society for Testing and Materials, West Conshohocken, Pennsylvania.
5. ASTM D431 1991. Standard Methods for Designating the Size of Coal from Its Sieve Analysis. Annual Book of ASTM Standards. Section 05.05. American Society for Testing and Materials, West Conshohocken, Pennsylvania.