Muundjua, M.; Hart R.J.; Golder S.A.; Carporzen L.; Galdeano A. "Magnetic imaging of the Vredefort impact crater, South Africa". Earth and Planetary Science Letters. 261 (3–4). 2007: 456–468. Bibcode:2007E&PSL.261..456M. doi:10.1016/j.epsl.2007.07.044.
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Muundjua, M.; Hart R.J.; Golder S.A.; Carporzen L.; Galdeano A. "Magnetic imaging of the Vredefort impact crater, South Africa". Earth and Planetary Science Letters. 261 (3–4). 2007: 456–468. Bibcode:2007E&PSL.261..456M. doi:10.1016/j.epsl.2007.07.044.