Helmstaedt, H.H., and R.M. Harrap. “Tectonic Aspects of the Kimberlite - Diamond - Upper-Mantle-Sample Connection: Does a Coherent Model Evolve?”. International Kimberlite Conference: Extended Abstracts 7, no. 1 (April 17, 1998): 331–335. Accessed March 28, 2024. https://ikcabstracts.com/index.php/ikc/article/view/2726.