Pearson, D.G., et al. “Laser 40Ar 39Ar Analyses of Phlogopites from Kimberlites and Thier Xenoliths: Constraints on Eruption Ages of Southern African and Siberian Kimberlites and Mantle Volatile Compositions”. International Kimberlite Conference: Extended Abstracts, vol. 6, no. 1, Sept. 1995, pp. 424-6, doi:10.29173/ikc1917.