1. Anon., “Platinum Production in South Africa on the Increase,” Precious Metals, 13(5) (1989), p. 1.
2. Anon., “Progress at Lac des Iles Pt-Pd Project,” Mining Magazine, 157(3) (1987), pp. 191–192.
3. G.J. Hodges and R.C. Clifford, “Recovering Platinum and Palladium at Stillwater,” JOM, 40(6) (1988), pp. 32–35.
4. J.C. Mostert and P.N. Roberts, “Electric Smelting at Rustenburg Platinum Mines Limitedh.,” Journal of the South African Institute of Mining and Metallurgy, 73(9) (1973), pp. 290–299.
5. V.C. Ward, “Electric Smelting … Western Platinum Ltd.,” TMS Paper A72-28 (1978).