1. K. Grjotheim and B. Welch: Aluminium Smelter Technology. Aluminium Verlag, Dusseldorf, 1980.
2. J. Thonstad and S. Rolseth: Light Metals, Atlanta, Georgia, TMS, 1983, pp. 415-24.
3. M.P. Taylor and B.J. Welch: Metall. Trans. B, 1987, vol. 18B, pp. 391-98.
4. H. Pfundt, D. Vogelsang, and U. Gerling: Light Metals, TMS, Warrendale, PA, 1989, pp. 371-77.
5. J.N. Bruggeman and D.J. Danka: Light Metals, TMS, Warrendale, PA, 1990, pp. 203-09.