@book{3264,
	author = {Seminar on Addictionprevalence Estimation},
	title = {Estimating the prevalence of problem drug use in Europe},
	publisher = {EMCDDA - European Monitoring Centre on Drugs and Drug Addiction},
	year = {1997. },
	series = {EMCDDA Scientific Monograph Series},
	address = {Lisbon}
}