de Kock, M. O.; Beukes, N. J.; Adeniyi, E. O.; Cole, D.; Götz, A. E.; Geel, C.; Ossa, F.-G. Deflating the Shale Gas Potential of South Africa’s Main Karoo Basin. S. Afr. J. Sci. 2017, 113 (9/10), 12. https://doi.org/10.17159/sajs.2017/20160331.