Machin, K.J., and E.S. Barton. “The Petrology of the Rex Mine Kimberlite Fissures, Central Free State, South Africa”. International Kimberlite Conference: Extended Abstracts 7, no. 1 (April 17, 1998): 524–526. Accessed April 26, 2024. https://ikcabstracts.com/index.php/ikc/article/view/2791.