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2. Conclusions and recommendations,1999
3. Directorate General for Energy and Transport (2002) Report on Drugs, Medicines and Driving, Directorate General for Energy and Transport, Brussels
4. European monitoring centre for drugs and drug addiction (1999) Literature Review on the Relation Between Drug Use, Impaired Driving and Traffic Accidents (CT.97.EP.14), EMCDDA, Lisbon (http://www.emcdda.org/multimedia/project_reports/finalreportdrugsanddriving.pdf)
5. Review of investigations of prevalence of illicit drugs in road traffic in different European Countries;De Gier,1999