https://www.esri.ie/system/files/publications/RS155.pdf
https://insightcrime.org/wp-content/uploads/2022/12/The-End-of-Illegal-Marijuana-InSight-Crime-Dec-2022-2.pdf
https://single-market-economy.ec.europa.eu/system/files/2023-03/Study%202023%20CRM%20Assessment.pdf
https://www.exact.com/benl/downloads/finance/whitepaper-cijfers-altijd-het-antwoord