Deines, P., and D.P. Gold. “The Carbon Isotopic Composition of Carbonatites, Kimberlites, and Diamonds”. International Kimberlite Conference: Extended Abstracts 1 (August 13, 1973): 85–88. Accessed December 24, 2025. https://journals.library.ualberta.ca/ikcabstracts.com/index.php/ikc/article/view/854.