1. DIRECTIVE 2014/40/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 3 April 2014 on the approximation of the laws, regulations and administrative provisions of the Member States concerning the manufacture, presentation and sale of tobacco and related products and repealing Directive 2001/37/EC. http://ec.europa.eu/health/tobacco/docs/dir_201440_en.pdf.
2. SCENIHR. Scientific committee on emerging and newly identified health risks), Additives used in tobacco products. 25 Jan 2016 http://ec.europa.eu/health/scientific_committees/emerging/docs/scenihr_o_051.pdf.