Geringer, G.J. “Differentiation in the Upper Mantle Deduced from Minerals Found in the Kimberlite of the Roberts Victor Mine in the Boshof-Dealesville Area”. International Kimberlite Conference: Extended Abstracts 1 (August 13, 1973): 123–125. Accessed May 4, 2024. https://ikcabstracts.com/index.php/ikc/article/view/864.