1. W. A. Krivsky and R. Schuhmann Jr, Trans. Metall. Soc. AIME 221 (1961) 898.
2. A. Ghosh and G. R. St Pierre, ibid. 245 (1969) 2106.
3. H. L. Lukas, J. Weiss, H. Krieg, E. T. Henig and G. Petzow, High Temp. High Press. 14 (1982) 607.
4. V. I. Berdnikov and M. I. Karteleva, Izv. Vys?. U?eb. Zaved., ?ern Metallurg. 12 (1983) 132.
5. A. Schei and K. Larsen, in Proceedings of 39th Electric Furance Conference (ISS AIME, Warrendale, Pennsylvania 1981) p. 301.