1. L.S. Renzoni, U.S. patent 2,367,239 (1945).
2. L.S. Renzoni, U.S. patent 2,394,874 (1946).
3. L.S. Renzoni and W.V. Barker Extractive Metallurgy of Copper, Nickel, and Cobalt, ed. P. Queneau (New York: Interscience Publishers, 1961), pp. 535–545.
4. H. He and Q. Cai Nickel and Cobalt Metallurgy of China (Beijing: Metallurgical Publisher, 1998) (in Chinese).
5. B. Love, “Nickel and Cobalt Electrometallurgical Practice”, Aqueous Electrotechnologies: Progress in Theory and Practice, Pre-Conference Short Course (Warrendale, PA: TMS, 1997).