1. Å. Sterten, K. Hamberg and I. Mæland, Acta Chem. Scand., A36(1982), 329.
2. Å. Sterten and I. Mæland, Acta Chem.Scand., A39(1985), 241.
3. K. Grjotheim, C. Krohn, M. Malinovsky, K. Matiasovksy and J. Thonstad, Aluminium Electrolysis, 2nd ed., Aluminium-Verlag GmbH, Dusseldorf, 1982.
4. R.F. Robl, W.E. Haupin and D. Sharma, Light Metals 1977, 106th Annual Meeting of AIME, Atlanta, 1977, Vol. 1., p. 185.
5. B. Lillebuen, S.A. Ytterdahl, R. Huglen and K.A. Paulsen, Electrochim.Acta, 25(1980), 131.