1. United States Food and Drug Administration. Mercury compounds in drugs and foods. Center for Biologics Evaluation and Research (CBER). 2001.
2. United States Geological Service (U.S.G.S.). U.S. Geological Survey, Mineral Commodity Summaries (Mercury). 2002.
3. United States Geological Service (U.S.G.S.). U.S. Geological Survey, Mineral Commodity Summaries (Mercury). 1999.
4. Chevalier, P. Mercury. Canadian Minerals Yearbook 1999. Natural Resources Canada. 2000.
5. Byrne L. Brazil’s mercury poisoning disaster. Brit Med J 1992; 304: 1397.