1. International Agency for Research on Cancer, Lyon, France, 2003, http://www.iarc.fr.
2. Food and Nutrition Board, Institute of Medicine, Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Molybdenum, Nickel, Silicon, Vanadium and Zinc, National Academy Press, Washington, DC, 2001.
3. Is chromium a trace essential metal?