de Bruin, D. “Clinopyroxene Megacrysts from the Kalkput Kimberlite: A Group 2 Kimberlite from the Prieska Group of Kimberlites”. International Kimberlite Conference: Extended Abstracts, vol. 6, no. 1, Sept. 1995, pp. 71-73, doi:10.29173/ikc1785.