1. A multi-city study of drug misuse in Europe;Hartnoll;Bull Narc,1989
2. Drug epidemiology in the European institutions: historical background and key indicators;Hartnoll;Bull Narc,2003
3. European Monitoring Centre for Drugs and Drug Addiction (EMCDDA) Key Indicators Gateway 2010 http://www.emcdda.europa.eu/themes/key-indicators http://www.webcitation.org/5wUfmmD7b
4. European Monitoring Centre for Drugs and Drug Addiction (EMCDDA) EMCDDA-Information on drugs and drug addiction in Europe 2009 http://www.emcdda.europa.eu/ http://www.webcitation.org/5wUg9terG