1. The determination of geological age by means of the natural radioactivity of rubidium;Ahrens;Trans. Geol. Soc. S. Afr.,1947
2. Radioactive ages of micas from granitic rocks by Rb-Sr and K-Ar methods;Aldrich;Trans. Am. Geophys. Union,1958
3. Rb-Sr age measurements on various Swaziland granites;Allsopp;J. geophys. Res.,1962
4. Geological and geochemical characteristics of the Heereveen and Mpuluzi batholiths south of the Barberton greenstone belt and preliminary thoughts on on their genesis;Anhaeusser,1983
5. Isotopic constraints on possible tectonic models for crustal evolution in the Barberton granite-greenstone terrane, Southern Africa;Barton,1983