1. EMCDDA http://www.emcdda.europa.eu/attachements.cfm/att_33244_EN_Annex_2_New_psychoactive_substances_reported_2006.pdf
2. EMCDDA http://www.emcdda.europa.eu/attachements.cfm/att_50194_EN_3_Annex_2_New_psychoactive_substances_reported_2007.pdf
3. EMCDDA http://www.emcdda.europa.eu/attachements.cfm/att_77265_EN_Annex%202_New%20psychoactive%20substances%20reported%202008.pdf
4. EMCDDA http://www.emcdda.europa.eu/attachements.cfm/att_101538_EN_Annex%202.pdf
5. EMCDDA http://www.emcdda.europa.eu/publications/implementation-reports/2010