1. K. Grjotheim, J. L. Holm, C. Krohn and J. Thonstad. Selected Topics in High-Temperature Chemistry, Forland, Grjotheim, Motzfeldt and Urnes, eds. Universitetsforlaget, Oslo1966, pp. 151–178.
2. G. Callaioli, U. Lecis and R. Morea. TMS Paper Selection, 99th AIME Annual Meeting, Denver, Colorado1970.
3. R. S. McClain, G. V. Sullivan and W. A. Stickney, U.S. Bur. Mines Rep. Invest. 5777, Washington1961.