1. EMCDDA 2011 Annual Report on the State of the Drugs Problem in Europe http://www.emcdda.europa.eu/attachements.cfm/att_143743_EN_EMCDDA_AR2011_EN.pdf
2. EMCDDA 2010 Annual Report on the State of the Drugs Problem in Europe http://www.emcdda.europa.eu/attachements.cfm/att_120104_EN_EMCDDA_AR2010_EN.pdf
3. EMCDDA 2009 Annual Report on the State of the Drugs Problem in Europe http://www.emcdda.europa.eu/attachements.cfm/att_93236_EN_EMCDDA_AR2009_EN.pdf
4. EMCDDA 2008 Annual Report on the State of the Drugs Problem in Europe http://www.emcdda.europa.eu/attachements.cfm/att_64227_EN_EMCDDA_AR08_en.pdf
5. Prevalence and co-existence of active components of ‘legal highs’;Zuba;Drug Test. Anal.,2012