1. V.A. Cammarota and D. Schlain: U.S. Bureau of Mines R.I. No. 7370, 1970.
2. J. Thonstad:Int. Meeting on Anode Problems in Aluminium Electrolysis. Milan, June U.S. Government Printing Office, Washington. DC, 1971; appeared inTravaux ICSOBA, 1973, No. 10, pp. 75–86.
3. O. Bowitz and O. Sandberg:Trans. TMS-AIME, 1962, vol. 224, pp. 53–60.
4. A. Revazyan:Sov. J. Non-Ferrous Met., 1960, vol. 33 (3), pp. 51–54.
5. J. Thonstad:J. Electrochem. Soc., 1964, vol. 111, pp. 959–65.