
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1729en.pdf

https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef18019en.pdf

http://www.globalcommissionondrugs.org/wp-content/uploads/2018/09/ENG-2018_Regulation_Report_WEB-FINAL.pdf