1. Anthony, J.C., Helzer, J.E., 1991. Syndromes of drug abuse and dependence. In: Robins L.N., Regier, D.A. (Eds), Psychiatric Disorders in America: The Epidemiologic Catchment Area Study. The Free Press, New York.
2. Australian Bureau of Criminal Intelligence, 1996. Australian Illicit Drug Report, 1995–1996. Commonwealth of Australia, Canberra.
3. Retention in methadone maintenance and heroin addicts' risk of death;Caplehorn;Addiction,1994
4. The natural history of drug use from adolescence to the mid-thirties in a general population sample;Chen;Am. J. Public Health,1995
5. Levels and correlates of polydrug use among heroin users and regular amphetamine users;Darke;Drug Alcohol Depend.,1995