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Schoenberg, Ronny; Kruger, F. Johan; Nägler, Thomas; Meisel, Thomas; Kramers, Jan Dirk (1999). PGE enrichment in chromitite layers and the Merensky Reef of the western Bushveld Complex; a Re–Os and Rb–Sr isotope study. Earth and planetary science letters, 172(1-2), pp. 49-64. Elsevier 10.1016/S0012-821X(99)00198-3
