1. ATSDR (1995) U.S. Department of Health and Human Services. Agency for Toxic Substances and Disease Registry, Atlanta, GA
2. ATSDR (2001) U.S. Department of Health and Human Services. Agency for Toxic Substances and Disease Registry, Atlanta, GA
3. ATSDR (2002) U.S. Department of Health and Human Services. Agency for Toxic Substances and Disease Registry, Atlanta, GA
4. The Danish Veterinary and Food Administration. Report 2003:15
5. Heindel JJ, Powel CJ (1992) Toxicol Appl Pharmacol 115:116–123