Morekhure-Mphahlele R, Focke WW, Grote W. Characterisation of vumba and ubumba clays used for cosmetic purposes. S. Afr. J. Sci. [Internet]. 2017 Mar. 29 [cited 2024 Nov. 22];113(3/4):5. Available from: https://sajs.co.za/article/view/3754