Nowell, G.M., and D.G. Pearson. “Hf Isotope Constraints on the Genesis of Kimberiitic Megacrysts: Evidence for a Deep Mantle Component in Kimberlites”. International Kimberlite Conference: Extended Abstracts, vol. 7, no. 1, Apr. 1998, pp. 634-6, doi:10.29173/ikc2829.