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3. WHO Technical Report Series No. 799, 36th Report of the Joint FAO/WHO Expert Committee on Food Additives, WHO, Switzerland, 1990.
4. FAO Food and Nutrition Papers 41/4, 1991, monographs prepared by the 38th Meeting of the Joint FAO/WHO Expert Committee on Food Additives, January, Rome.
5. Commission of the European Communities, Establishment by the European Community of Maximum Residue Limits (MRLs) for Residues of Veterinary Medical Products in Foodstuffs of Animal Origin, The Rules Governing Medical Products in the European Community, October 1991, ECSC-EEC-EAEC, Brussels.