Janney, P., le Roex, A. and Viljoen, K. (1998) “Trace element and isotopic charateristics of olivine melilitites from the Western Cape, South Africa: implications for the sources of group 1 kimberlites”, International Kimberlite Conference: Extended Abstracts, 7(1), pp. 374–376. doi: 10.29173/ikc2739.