1. H. Kvande, J. Chen and W. Haupin, Light Metals 1994, p. 429 – 440.
2. B. J. Welch, lecture at “The 8th International Course on Process Metallurgy of Aluminium”, NTH, Trondheim, Norway, 1989.
3. Li Jie, Huang Yongzhong, Wang Huazhang and Liu Yexiang, Light Metals 1994, p. 441–447.
4. W. E. Haupin, in A. R. Burkin (ed.), Production of Aluminium and Alumina, (Chichester etc.: John Wiley & Sons, 1987), Chapter 9, p. 150–158.
5. G. T. Holmes, Light Metals 1995, p. 371–373.