1. K. Grjotheim, C. Krohn, M. Malinovsky, K. Matiasovsky and J. Thonstad, ?Aluminium Electrolysis?, Aluminium-Verlag, Dusseldorf (1982).
2. K. Andreassen,Erzmetall. 31, (1978) 301.
3. W. Kunz and P. Klencz, in Ullmann: ?Encyclopedia der technischen Chemie?, 4th edn Chemie, Weinheim (1979) Vol. 17 p. 143.
4. E. Coley, in ?Molten Salt Technology? (edited by D. G. Lovering), Plenum Press, New York (1982), p. 57.
5. A. H. W. Aten,Z. Phys. Chem. 66 (1909) 641.