1. European Directive 76/768/EEC and its successive amendments, basic act 31976L0768, http://europa.eu.int/eur-lex/en/lif/reg/en_register_133016.html.
2. FDA, Departament of Health and Human Services, 21CFR Parts 310, 352, 700 and 740, RIN 0910-AA01, Sunscreen Drug Products for over-the-counter Human Use Final Monograph, Federal Register, Rules and Regulations, 64 (1999) 27666–27693.
3. Japanese Standard of Cosmetic Ingredients,1985
4. Immune cell traffic from blood through the normal human skin to lymphatics
5. Contact and photocontact sensitivity to sunscreens