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3. Solar System Evolution — A New Perspective;Taylor,1992
4. Geology and evolution of the Vredefort Impact Structure, South Africa;Reimold;J. Afr. Earth Sci.,1996
5. Integrated gravity and magnetic modelling of the Verdefort impact structure — reinterpretation of the Witwatersrand Basin as the erosional remnant of an impact basin;Henkel;Econ. Geol. Res. Unit, Univ. Witwatersrand, Inf. Circ. 299,1996