1. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium and Zinc,2001
2. beta-Carotene: An unusual type of lipid antioxidant;Burton;Science,1984
3. Cardiac arrest due to liquoriceinduced hypokalaemia;Bannister;Br. Med. J.,1977
4. Risk and safety assessment on the consumption of Licorice root (Glycyrrhiza sp.), its extract and powder as a food ingredient, with emphasis on the pharmacology and toxicology of glycyrrhizin
5. Food safety. FDA should strengthen its oversight of food ingredients determined to be generally recognized as safe (GRAS)http://www.gao.gov/new.items/d10246.pdf