1. E.G. West, Copper and its Alloys, Ellis Horwood, Chichester, 1982, p. 1.
2. W.G. Davenport, M. King, M. Schlesinger, and A.K. Biswas, Extractive Metallurgy of Copper, 4th Ed., Elsevier, Amsterdam, 2002, p. 57.
3. T. Rosenqvist, Phase equilibria in the pyrometallurgy of sulfide ores, Metall. Trans. B, 9(1978), p. 337.
4. T. Rosenqvist, Principles of Extractive Metallurgy, 2nd Ed., McGraw Hill, New York, 1983, p. 226.
5. U.O. Igiehon, B.S. Terry, and P. Grieveson, Carbothermic reduction of antimony sulphide, Trans. Inst. Min. Metall. Sect. C, 101(1992), p. 144.