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Wiessing, Lucas and Augustin, R and Uhl, Alfred and Kummler, P and Kraus, L and Frischer, Martin (2003) Estimating prevalence of problem drug use at national level in countries of the European Union and Norway. Addiction, 98, (4), pp. 471-485. https://doi.org/10.1046/j.1360-0443.2003.00326.x.
Hartnoll, Richard and Frischer, Martin and Wiessing, Lucas and Bello, Pierre-Yves and Kraus, L and McKeganey, Neil and D'Ippoliti, Daniela and Domingo-Salvany, Antonia and Smit, Filip and Hay, Gordon (1999) Methodological guidelines to estimate the prevalence of problem drug use on the local level. Lisbon: European Monitoring Centre for Drugs and Drug Addiction.