[1]
R. F. Rifkin, F. d’Errico, L. Dayet-Boulliot, and B. Summers, “Assessing the photoprotective effects of red ochre on human skin by in vitro laboratory experiments”, S. Afr. J. Sci., vol. 111, no. 3/4, pp. 1–8, Mar. 2015, doi: 10.17159/sajs.2015/20140202.