1. Q. Yuan, X. Liu, Y. Zhong, and Z. Ren: Yunnan Metall., 2003, vol. 32, pp. 106–108.
2. K. Adams and E.J. Wea: Mod. Cast., 2002, vol. 92, pp. 19–21.
3. D.A. Doutre and R.I.L. Guthrie: Patent Nos. US4555662A, DE3478143D1, EP0119770A2, EP0119770A3, EP0119770B1, EP0119770B2, 1985.
4. D.A. Doutre and R.I.L. Guthrie: Patent No. US4600880, 1985.
5. M. Li and R.I.L. Guthrie: ISIJ Int., 2001, vol. 41, no. 2, pp. 101–10.