Ferguson, J., H. Martin, L.O. Nicolaysen, and R.V. Danchin. “Gross Brukkaros: A Kimberlite-Carbonatite Volcano”. International Kimberlite Conference: Extended Abstracts 1 (August 13, 1973): 107–110. Accessed July 3, 2024. https://ikcabstracts.com/index.php/ikc/article/view/860.