Ncube, E.J.

Ncube, E.J. & Schutte, C.F., 2005. The occurrence of fluoride in South African groundwater : a water quality and health problem. , pp.p. 35-40 : 5 fig., 6 tab. Available at: https://nl.ircwash.org/sites/default/files/Ncube-2005-Occurrence.pdf.