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2. The age of South African kimberlites and their occurrence in Cretaceous beds;Harger;Trans. Geol. Soc. South Africa,1921
3. Potassium-Argon age study of possible lower-crust and upper-mantle inclusions in deep-seated instrusions;Lovering;J. Geophys. Res.,1964
4. H.L. Allsopp, P. Hahn-Weinheimer and L.O. Nicolaysen, K/Rb ratios and Sr-isotopic composition of minerals in peridotitic and eclogitic rocks, in preparation.
5. Stratigraphic interpretation of age measurements in South Africa;Nicolaysen;Geol. Soc. America Buddington Vol.,1962