1. Chemical Cleaning of Coal-Effect on the Removal of Trace Elements;Norton,1986
2. Mineral Matter and Trace Elements in the Herrin and Springfield Coals, Illinois Basin Coal Field;Harvey,1983
3. Geochemistry;Goldschmidt,1954
4. Occurrence and Distribution of Potentially Volatile Trace Elements in Coal;Ruch,1974
5. Coal Science;Zubovic,1966