1. United Nations Office on Drugs and Crime. [webpage on the Internet]. World Drug Report 2007 [cited 2008 Aug 20]. Available from:http://www.unodc.org/pdf/research/wdr07/WDR_ 2007.pdf
2. Wood DM, Dargan PI, Button J, Holt DW, Ovaska H, Ramsey J, et al. Collapse, reported seizure—and an unexpected pill.Lancet 2007; 369: 1490.
3. Sheridan J, Butler R, Wilkins C, Russell B. Legal piperazine-containing party pills—a new trend in substance misuse. Drug Alcohol Rev. 2007; 26: 335–343.
4. Drug Enforcement Administration. Schedules of controlled substances; placement of 2,5-dimethoxy-4-(n)-propylthiophenethylamine and N-benzylpiperazine into Schedule I of the Controlled Substances Act. Final rule.Fed Regist 2004: 69; 12794–12797.
5. European Monitoring Centre for Drugs and Drug Addiction [webpage on the Internet]. New Commission proposal to strengthen control of synthetic drug BZP press release [updated 2007 Jul 17; cited 2008 Aug 20]. Available from:http://europa.eu/mpid/pressReleasesAction.do?reference=IP/07/1103&format=HTML&aged=0&language=EN&guiLanguage=en