McCammon, C.A., and W.L. Griffin. “Determination of Ferric Iron Variation Within Zoned Garnets from the Wesselton Kimberlite Using a Mossbauer Milliprobe”. International Kimberlite Conference: Extended Abstracts, vol. 6, no. 1, Sept. 1995, pp. 362-4, doi:10.29173/ikc1893.