McCammon, C.A., et al. “Determination of the Ferric Iron Content of Diamond Inclusions from George Creek Using Mossbauer Specrtoscopy With Implications for Mantle Oxygen Fugacity During Diamond Genesis”. International Kimberlite Conference: Extended Abstracts, vol. 6, no. 1, Sept. 1995, pp. 359-61, doi:10.29173/ikc1892.