1. A.S. Hutchcraft, Jr., “Developments in Alumina 1970–80,” Metal Bulletin Aluminum Report (1977) pp. 23–27.
2. V. Sparwald, “Beitrag zur Bedeutung der physikalischen Beschaffenheit von Aluminiumoxide fur die AI-Gewinnung durch Schmelzflusselektrolyse,” Erzmetall, 31(11) (1978) pp. 504–507.
3. E. Barillon, “Avantages et inconvénients au niveau de l’électrolyse et de l’épuration des gaz de cuves, des divers types d’alumine BAYER,” 4th Int. Congress ICSOBA (1978) Athens, Vol. 3, pp. 1–17.
4. L.N. Less, “The Crusting Behaviour of Smelter Aluminas,” Met. Trans., 8B, June 1977.
5. E. Böhm, L. Reh, U. Sparwald, G. Winkhaus, “Removal of Impurities in Aluminum Smelter Dry Gas Cleaning Using the VAW/LURGI Process,” Light Metals 1976, Vol. 2, pp. 509–525.