1. Necrotising hepatitis after taking herbal remedies;Strahl;Dtsch Med Wschr,1998
2. Kava extracts;Teschke;safety and risks including rare hepatotoxicity,2003
3. Kava - the unfolding story;Denham;report on a work-in-progress,2002
4. Piper methysticum http://www.spc.int/cis/documents/02_0714_BfArM_Kava_Removal.pdf