1. C.E. Ransley, “The Application of the Refractory Carbides and Borides to Aluminum Reduction Cells,” New Process and Materials of Construction, 1962, Extractive Metallurgy of Aluminum, Vol. 2, Aluminum, ed. by Gary Gerard, Interscience Publishers, John Wiley & Sons, 1962, p. 481.
2. C.N. Cochran, U.S. Patent No. 3, 971, 653, July 27, 1976.
3. G. Gitlesen, O. Herstad, and K. Motzfeldt, in Selected Topics in High Temperature Chemistry, ed. by T. Forland et al., Universitetforlaget, Oslo, 1966, p. 179–196.
4. P.T. Stroup, Trans TMS-AIME 230 (1964) p. 356–371.
5. E.W. Dewing et al., U.S. Patent No. 4, 213, 599, July 22, 1980; No. 4, 099, 959, July 11, 1978.