Pretorius, C.C., J. Blume, H. Lutjen, and K. Trofimczyk. 1998. “Results of Geophysical Trials to Profile the Kimberlite Host Rock Contacts at Venetia Mine and the BK-9 Pipe”. International Kimberlite Conference: Extended Abstracts 7 (1):708-9. https://doi.org/10.29173/ikc2854.