1. U.S. Geological Survey.
https://www.usgs.gov/centers/nmic/minerals-yearbook-metals-and-minerals
2. Thonstad J, Fellner P, Haarberg GM, Hives J, Kvande H, Sterten Å (2001) Aluminium electrolysis: fundamentals of the Hall-Heroult process. Aluminium-Verlag, Düsseldorf
3. Solheim A, Sterten Å (1997) Activity data for the system NaF-AlF3. In: Proceedings of the ninth international symposium on light metals production, Trondheim, Norway, p 225
4. Skybakmoen E, Solheim A, Sterten Å (1997) Alumina solubility in molten salt systems of interest for aluminum electrolysis and related phase diagram data. Metall Mater Trans B 28B:81–86
5. Sterten Å (1980) Structural entities in NaF-AlF3 melts containing alumina. Electrochim Acta 25:1673