1. J. E. Dutrizac: Proceedings of a World Symposium on Metallurgy and Environmental Control, Sponsored by the TMS Lead, Zinc, and Tin Committee, 1990, vol. 11, pp. 161–91.
2. J.D. Scott and U. Dienstbach: in IMM Conf. on Extractive Metallurgy, 1990, pp. 121–34.
3. T. T. Chen, and J. E. Dutrizac: Metall. Trans. B, 1988; vol. 19, pp. 803-817.
4. P. K. Ackerman, G. H. Harris, R. R. Klimpel and F. F. Aplan: Int. J. Miner. Process., 2000, vol. 58, 1-13.
5. P. Somasundaran and M. B. Moudgil: Reagents in Mineral Technology, 21st ed., New York, N. Y., Marcel Dekker Inc., 1998, pp. 79–104.