1. 1) Y. Wiryokusumo, A. S. Loebis, T. Badrujaman and T. Miraza: Proceedings of the Nickel-Cobalt 97, vol. III Pyrometallurgical Operations, the Environment and Vessel Integrity in Nonferrous Smelting and Converting, (Metallurgical Society of CIM, 1997) pp. 175–189.
2. 2) Korean Zinc Nickel Plant: Private Communication, 1997, October 6.
3. 3) B. Terry: Extractive Metallurgy of Nickel, ed. by A. R. Burkin (John Wiley & Sons, 1987) pp. 24–28.
4. 4) R. U. Pagador, M. Hino and K. Itagaki: Metall. Rev. MMIJ 13 (1996) 90–103.
5. 5) R. U. Pagador, M. Hino and K. Itagaki: Mater. Trans., JIM 40 (1999) 225–232.