1. Sykes, J., “The Control of Quality in Melting and Casting Copper,” Enfield Copper Refining Co., Ltd., Journal of the Institute of Metals, Vol. 81, 1952–53, Brimsdown, Enfield, Middlesex, England
2. “New Refining Method in the Production of Anode Copper,” Phelps Dodge brochure on use of refonned gas for copper refining, Sept. 7, 1961
3. Henych, R., Kadlec, F., and Sedlacek, V., Journal of Metals, April 1965
4. Foard, J. E. and Beck, R. R., “Copper Smelting-Current Practices and Future Developments,” Kennecott Copper Corp., prepared for AIME Annual Meeting February–March 1971, New York City
5. Kuzell, C. R. et aI, “Apparatus for Reforming Gases,” U.S. patent No. 3,071,454, Jan. 1, 1963