1. United Nations Office on Drugs and Crime. The challenge of new psychoactive substances. Vienna: Global SMART Programme; 2013.
2. European Monitoring Centre for Drugs and Drug Addiction. New psychoactive substances in Europe: an update from the EU Early Warning System. Luxembourg: Publications Office of the European Union; 2015.
3. European Monitoring Centre for Drugs and Drug Addiction; Europol. EU drug markets report: In-depth analysis. Luxembourg: EMCCDA-Europol joint publication, Publications Office of the European Union; 2016.
4. United Nations Office on Drugs and Crime. Post-UNGASS 2016: NPS trends, challenges and recommendations—Global SMART Update, vol. 16. Vienna: Global SMART Programme; 2016.
5. United Nations Office on Drug and Crime. Understanding the synthetic drug market: the NPS factor—Global SMART Update, vol. 19. Vienna: Global SMART Programme; 2018.