1. A. J. Clegg, Found. Trade J. Int.
9 (1986) 51.
2. H. J. Heine, Found. M T
114 (1986) 36.
3. G. del Gaudio, G. Serramoglia, G. Caironi and G. Tosi, Metall. Sci. Technol.
3 (1985) 76.
4. A. J. Clegg, Found. Trade J.
145 (1978) 393.
5. Idem, ibid., 145 (1978) 149.