1. American Conference of Industrial Hygienists (ACGIH), 2001. Cobalt, All Inorganic Forms, Except Cobalt Oxides: BEI. American Conference of Industrial Hygienists, Cincinnati, OH.
2. Assessment of reference values for selected elements in a healthy urban population;Alimonti;Ann. Ist. Super. Sanita,2005
3. Metal ion levels in the blood of patients after hip resurfacing: a comparison between twenty-eight and thirty-six-millimeter-head metal-on-metal prostheses;Antoniou;J. Bone Joint Surg. Am.,2008
4. Agency for Toxic Substances and Disease Registry (ATSDR), 2004. Toxicological Profile for Cobalt. U.S. Department of Health and Human Services, Public Health Service, Agency for Toxic Substances and Disease Registry, Atlanta, GA.
5. Dietary supplement use in the United States, 2003–2006;Bailey;J. Nutr.,2011