Rifkin RF, d’Errico F, Dayet-Boulliot L, Summers B. Assessing the photoprotective effects of red ochre on human skin by in vitro laboratory experiments. S. Afr. J. Sci. [Internet]. 2015 Mar. 27 [cited 2024 Nov. 22];111(3/4):1-8. Available from: https://sajs.co.za/article/view/3568