1. A brief history of ‘new psychoactive substances’;King;Drug Test. Anal.,2011
2. Chapter 33: what’s so "New" about new psychoactive substances? Definitions, prevalence, motivations, user groups and a proposed new taxonomy;Measham,2016
3. New psychoactive substances: An actual problem or an overestimated phenomenon?;Vaiano;Forensic Sci. Int.,2019
4. European Drug Report 2019;European Monitoring Centre for Drugs and Drug Addiction,2019
5. World Drug Report 2019. Austria;United Nations Office on Drugs and Crime (UNODC),2019