Klump, J., and J.J. Gurney. “A Pilot Study of the Swartruggens Kimberlite Dyke Swarm”. International Kimberlite Conference: Extended Abstracts 7, no. 1 (April 17, 1998): 441–442. Accessed November 24, 2024. https://ikcabstracts.com/index.php/ikc/article/view/2761.