(EN) Edzard Ernst, Toxic heavy metals and undeclared drugs in Asian medicine (abstract), in Trends in Pharmacological Sciences, vol. 23, n. 3, aprile 2002, pp. 136-139.
(EN) S Y Liu, S O Woo e H L Koh, HPLC and GC–MS screening of Chinese proprietary medicine for undeclared therapeutic substances (abstract), in J. Pharm. Biomed. Anal., vol. 24, n. 5-6, marzo 2001, pp. 983-992.
(EN) F. M. Keane e A. W. du Vivier et al., Analysis of Chinese herbal creams prescribed for dermatological conditions (abstract), in British Medical Journal, vol. 318, n. 7183, 1999, pp. 563-564.