McCammon, C., Chinn, I., Gurney, J., & McCallum, M. (1995). 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, 6(1), 359–361. https://doi.org/10.29173/ikc1892