1. Ziegler, A., Jonason, A.S., Leffell, D.J., Simon, J.A., Sharma, H.W., Kimmelman, J., Remington, L., Jacks, T., Brash, D.E., Nature, 1994, vol. 372, p. 773.
2. Ananthaswamy, H.N., Loughlin, S.M., Cox, P., Evans, R.L., Ullrich, S.E., Kripke, M.L., Nat. Med., 1997, vol. 3, p. 510.
3. Chawla, H.M., Proceedings of European UV Sunfilters conference. Paris, November, 1999, p. 161.
4. European Directive 76/768/EEC and its successive amendments, basic act 31976L0768, http://europa.eu.int/eurlex/en/lif/reg/en_register_133016.html .
5. FDA, Department of Health and Human Services, 21 CFR Parts 310, 352, 700 and 740, RIN 0910-AA01, Sunscreen Drug Products for the Over-the-Counter Human Use Final Monograph, Federal Register, Rules and Regulations. 1999, vol. 64, p. 27666–27693.