1. Toxicological profile for nickel;Agency for Toxic Substances and Disease Registry (ATSDR),2005
2. The redistribution of trace elements during beneficiation of coal;Akers,1995
3. Bai XF. The distributions, modes of occurrence and volatility of trace elements in coals of China. Ph.D. Dissertation. China Coal Research Institute, Beijing, China, 2003. (in Chinese with abstract in English).
4. Volatility of Cu, Ni, Cr, Co, Pb, and As in fluidized-bed combustion chamber in relation to their modes of occurrence in coal;Bartoňová;World Acad Sci Eng Technol,2009
5. Estimating air toxics emissions from coal and oil combustion sources;Brooks,1989