1. TR TS (Technical Regulations of the Customs Union) 021/2011: On the Safety of Food Products, Moscow, 2011, no. 880.
2. Commission Regulation (EC) no. 1881/2006: Setting Maximum Levels for Certain Contaminants in Foodstuffs, Brussels: European Commission, 2006.
3. GOST (State Standard) 31671-2012: Foodstuffs. Determination of Trace Elements. Preparation of Samples by Pressure Digestion, Moscow, 2014.
4. Aras, N.K. and Ataman, O.Y., Trace Element Analysis of Food and Diet, Cambridge: R. Soc. Chem., 2006.
5. GOST (State Standard) R 51301-99: Foodstuffs and Food Raw Materials. Anodic Stripping Voltammetric Methods of Toxic Traces Elements Determination (Cadmium, Lead, Copper and Zinc), Moscow, 2010.