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Faure et al. 1996, p. 189. Faure, K.; Armstrong, R.A.; Harris, C.; Willis, J.P. (August 1996). "Provenance of mudstones in the Karoo Supergroup of the Ellisras basin, South Africa: Geochemical evidence". Journal of African Earth Sciences. 23 (2): 189–204. Bibcode:1996JAfES..23..189F. doi:10.1016/S0899-5362(96)00061-9.