1. 1) Manual of A.S.T.M. Standards on Refractory Materiale (1937)
2. 2) The Open Hearth Furnace, Vols. I, II and III, by W. C. Buell, Jr.
3. 3) Hayman, J.C., Trans. Ceram. Soc., 1939, 38, 529 and 536
4. 4) Special Report of the Iron and Steel Institute, No.26, 1939
5. 5) Larsen, B.M., Schroeder, F.W., Bauer, E.N., and J. W. Campbell. Carnegie Inst. of Techn. Mining and Metallurgical Invest., Bulletin No.23, 1925