McCallister, Robert H., et al. “Thermal History and Exsolution Microstructures of Two Clinopyroxenes from the Thaba Putsoa Kimberlite Pipe, Lesotho”. International Kimberlite Conference: Extended Abstracts, vol. 2, no. 1, Sept. 1977, pp. 203-4, doi:10.29173/ikc991.