1. IARC. IARC monographs on the evaluation of the carcinogenic risks to humans. Overall evaluations of carcinogenicity: an updating of IARC monographs, vol. 1–42 (Suppl. 7) (1987). Available from 〈http://monographs.iarc.fr/ENG/Monographs/supplements. php〉.
2. A global health problem caused by arsenic from natural sources
3. NBS. The 2011 Statistics Bulletin of the National Economic and Social Development of the People's Republic of China. National Bureau of Statistics (NBS) (2011). Available from 〈http://www.stats.gov.cn/tjgb/ndtjgb/qgndtjgb/t20120222 _402 786440.htm〉.
4. Trace element geochemical for coal;Ren,2006
5. Comparison of coal composition and elemental distribution in selected seams of the Sydney and Stellarton Basins, Nova Scotia, Eastern Canada