Blacic, J.D., E.A. Mathez, C. Maggiore, T.E. Mitchell, and R. Fogel. 1991. “Oxygen in Diamond by the Nuclear Microprobe: Analytical Technique and Initial Results”. International Kimberlite Conference: Extended Abstracts 5 (February):20-22. https://doi.org/10.29173/ikc2449.