1. J. C. Taylor H.R. Traulsen World Survey of Nonferrous Smelters, The Metallurgical Society of AIME, Warrendale, PA, U.S.A., 1987, 169-186
2. R.D. Prengaman “Lead Product Development in the Next Millennium,” Lead-Zinc 2000, J.E. Dutrizac, A.J. Gonzalez, D.M. Henke, S.E. James and A. Siegmund, Eds., The Minerals, Metals and Materials Society, Warrendale, PA, U.S.A., 2000
3. ILZG “Economics of Lead and Zinc,” International Lead Zinc Study Group - Statistics, http://www.ilzsg.org/statisticsasp?pg=eco, 2000
4. Zinc and Lead Review of Trends and Forecasts;ILZG;Metall,2000
5. Z. Liu “Development and Structure of Chinese Lead and Zinc Industry,” The Future of Lead and Zinc - Asia and the World, The Nonferrous Metals Society of China, Beijing, People's Republic of China, 1996, 8-20