1. Baum, W., and Knecht, J., 1994, Optimizing refractory and oxide gold ore operations with high-pressure grinding rolls,” SME Pre-Print 94-12.
2. Baum, W., Patzelt, N., and Knecht, J., 1996a, “The use of high pressure grinding rolls for optimization of copper leaching,” SME Pre-Print 96-68.
3. Baum, W., 1996b, “Optimizing copper leaching/SX-EW operations with mineralogical data,” SME Preprint 96-84, 7 pp.
4. Baum, W., Patzelt, N., and Knecht, J. 1997, “Metallurgical benefits of high-pressure roll grinding for gold and copper recovery,” SME Denver Special Proceedings Comminution Practices, Kawatra, S.K. ed., pp. 111–116.
5. Baum, W., 1998, “Copper mineralogy and extraction problems. How to reduce your losses,” Randol Copper Hydromet Roundtable’ 98, Vancouver, Proceedings, pp. 41–51.