1. The redistribution of trace elements during the beneficiation of coal. Chapter 6;Akers,1995
2. Assessment of Coal Cleaning for Trace Element Control;Akers,1998
3. An overview of the use of coal cleaning to reduce air toxics;Akers;Miner. Metall. Process.,1993
4. Role of coal cleaning in control of air toxics;Akers;Fuel Process. Technol.,1994
5. Coal cleaning: a precombustion air toxics control option;Akers,1994