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3. United States Government. Code of Federal Regulations. Food and drugs: food additives permitted for direct addition to food for human consumption. Special Dietary and Nutritional Additives: 21CFR172. Available at: http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfCFR/CFRSearch.cfm?CFRPart=172&showFR=1&subpartNode=21:3.0.1.1.3.4 . (accessed 02 October 2012).
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