Shelkov, D., A.B. Verchovskyl, H.J. Milledge, and C.T. Pillinger. “Carbonado: A Comparison Between Brazilian and Ubangui Sources Based on Carbon and Nitrogen Isotopes”. International Kimberlite Conference: Extended Abstracts 6, no. 1 (September 19, 1995): 518–520. Accessed April 25, 2024. https://ikcabstracts.com/index.php/ikc/article/view/1952.