1. Campbell IR, Cass JS, Cholak J, Kehce RA (1957) AMA Arch Ind Health 15: 359
2. Grjotheim K, Krohn C, Malinovsky M, Matiasovsky K, Thonstad J (1982) Fundamentals of Hall-Héroult Process. In: Aluminium Electrolysis 2 ed., Aluminium-Verlag, Düsseldorf
3. Sorenson JRJ, Campbell IR, Tepper LB, Lingg RD (1974) Environ Health Persp 8: 3
4. Anonymous (1989) Metal Bulletin No. 7354: 7
5. Pawlek R ( 1986, 1989 ) Primary Aluminium Smelters and Producers of the World, Aluminium-Verlag, Düsseldorf