Schreyer, W., O. Medenbach, K. Abraham, and L.O. Nicolaysen. 1977. “CO2-Rich Fluid Inclusions in the Polymetamorphic Basement Rocks of the Vredefort Structure, South Africa, and Their Possible Bearing on Its Origin”. International Kimberlite Conference: Extended Abstracts 2 (1):288-90. https://doi.org/10.29173/ikc1024.