1. Svobodova A, Walterova D, Vostalova J. Ultraviolet light induced alteration to the skin. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub. 2006 Jul;150(1):25-38.
2. Kullavanijaya P, Lim HW. Photoprotection. J Am Acad Dermatol. 2005 Jun;52(6):937-58; quiz 959-62.
3. The Commission of the European Communities, Regulation (EC) No 1223/2009 of the European Parliament and of the Council of 30 November 2009 on cosmetic products, 2009.
4. The Commission of the European Communities, COMMISSION RECOMMENDATION of 22 September 2006 on the efficacy of sunscreen products and the claims made relating thereto, Official Journal of the European Union, pp. 39–43, 2006, [Online]. https://eur-lex.europa.eu/legal-content/IT/TXT/PDF/?uri=CELEX:32006H0647&from=EN
5. ISO 24444:2019(en), Cosmetics — Sun protection test methods — In vivo determination of the sun protection factor (SPF). Accessed: Oct. 08, 2023. [Online]. https://www.iso.org/obp/ui/en/#iso:std:iso:24444:ed-2:v1:en