1. The role of chemical fingerprinting: application to Ephedra
2. U.S. Food and Drug Administration, White Paper on Ephedra: Evidence on the Safety and Effectiveness of Ephedra: Implications for Regulations; http://www.fda.gov/bbs/topics/NEWS/ephedra/whitepaper.html.
3. The World Anti-doping Code: The 2005 Prohibited List, International Standard, World Anti-doping Agency, 2005. http://www.wada-ama.org/rtecontent/document/list_2005.pdf.
4. US Department of Health and Human Services, US Food & Drug Administration, Center for Food Safety and Applied Nutrition Dietary Supplements: Ephedrine alkaloids. www.cfsan.fda.gov/˜dms/ds-ephed.html.
5. Determination of ephedrines in urine by gas chromatography–mass spectrometry