Nixon, P. H., G. R. Davies, V. V. Slodkevich, and S. C. Bergman. 1986. “Graphite Pseudomorphs After Diamond in the Eclogite-Peridotite Massif of Beni Bousera, Morocco and a Review of Anomalous Diamond Occurrences”. International Kimberlite Conference: Extended Abstracts 4 (1):412-14. https://doi.org/10.29173/ikc1187.