1. J. Thonstad and Y. Liu:Light Metals, Proceedings of Sessions 110th AIME Annual Meeting, G. M. Bell, ed., Chicago, IL, 1981, p. 303.
2. K. Grjotheim, C. Krohn, M. Malinovsky, K. Matiasovsky, and J. Thonstad:Aluminum Electrolysis, 2nd ed., Aluminum-Verlag, Duesseldorf, Germany, 1982. p. 143.
3. P. Kozakevitch and G. Urbain:J. Iron Steel Inst., 1957, vol. 186, p. 167.
4. J.F. Elliott and M. Mounier:Can. Metall. Quart., 1982, vol. 21, p. 415.
5. H. Gaye, L.D. Lucas, M. Olette, and P. V. Riboud:Can. Metall. Quart., 1984, vol. 23, p. 179.