1. Themelis, N.J., and Spira, P.; Canadian Patent No. 758,020, May 2, 1967; U.S. Patent No. 3,437,475, April 8, 1969.
2. “Noranda Pilots Continuous Copper Smelting”, Eng. and Min. J., Vol. 169, 1968, no. 5, pp. 85–87.
3. Themelis, N.J., and Tarassoff, P.; Canadian Patent No. 833,475, Feb. 3, 1970.
4. Tsurumoto, T.; “Improvements on the Oxygen Smelting Process at Hitachi Smelter”, Pyro-metaiiurgical Processes in Non-ferrous Metallurgy, J.N. Anderson and P.E. Queneau, editors, Gordon and Breach, New York, 1967, pp. 291–305.
5. Messner, M.E., and Kinneberg, D.A.; “Direct Converter Smelting at Utah Using Oxygen”, JOURNAL OF METALS, Vol. 22, 1969, no. 7, pp. 23–29.