1. EMCDDA European Drug Report 2015: Trends and Developments http://www.emcdda.europa.eu/publications/edr/trends-developments/2015
2. United Nations Office on Drugs and Crime World Drug Report 2015 https://www.unodc.org/wdr2015/
3. The new drug phenomenon;Brandt;Drug Test. Anal.,2014
4. United Nations Office on Drugs and Crime The challenge of new psychoactive substances 2013 http://www.unodc.org/documents/scientific/NPS_2013_SMART.pdf
5. Legal controls on cannabimimetics: An international dilemma?;King;Drug Test. Anal.,2014