1. (2003) Skin Protecting Drugs for Over-the-counter Use, US Federal register 68 (107): 33362–33381
2. Kang CW, Yap PF, Lim C, Chen YZ, Ho PC, Chan YW, Wong GP, Chan SY (2007) J Control Release 120:211–219
3. Kotan R, Kordali S, Cakir A (2007) J Biosci 62:507–513
4. Kaneda K, Matsuda K, (2007) Jpn Kokai Tokkyo Koho. JP 2007169233, A 20070705
5. Watt EE, Betts BA, Kotey FO, Humbert DJ, Griffith TN, Kelly EW, Veneskey KC, Gill N, Rowan KC, Jenkins A, Hall AC (2008) Eur J Pharmacol 59:120–126