1. Hazards of heavy metal contamination
2. Quantitative assessment of worldwide contamination of air, water and soils by trace metals
3. Toxicity, mechanism and health effects of some heavy metals
4. Directive 2013/39/EU of the European Parliament and of the Council of 12 August 2013 amending Directives 2000/60/EC and 2008/105/EC as regards priority substances in the field of water policy. Official Journal of the European Union (OJ), L226/1, 24.8.2013, Brussels. https://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2013:226:0001:0017:EN:PDF
5. Codex Alimentarius. General standard for contaminants and toxins in food and feed. CODEX STAN 193-1995. Adopted in 1995, Revised in 1997, 2006, 2008, 2009 Amended in 2010, 2012, 2013, 2014, 2015. Brussels. http://www.fao.org/