1. RbSr age determinations on South African kimberlite pipes;Allsopp;Phys. Chem. Earth,1975
2. RbSr and 40Ar/ 39Ar age determinations on phlogopite micas from the pre-Lebombo Group Dokolwayo pipe;Allsopp;Geol. Soc. S. Afr., Spec. Publ.,1985
3. A summary of radiometric dating methods applicable to kimberlites and related rocks;Allsopp,1986
4. Complementary petrographic and strontium-isotope ratio studies of South African kimberlite;Barrett;Phys. Chem. Earth,1975
5. A brief account of the geology and petrography of the Makganyene kimberlite;Bristow,1984