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Luxembourg: Office for Official Publ. of the European Communities, 1999
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Luxembourg: Office for Official Publications of the European Communities, 1997
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Luxembourg: Office for Official Publ. of the European Communities, 2004 ; Lisbon: European Monitoring Centre for Drugs and Drug Addiction, 2004
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Luxembourg: Office for Official Publ. of the European Communities, 2004 ; Lisbon: European Monitoring Centre for Drugs and Drug Addiction, 2004