1. van Vleck, J. H., Rev. Mod. Phys., 17, 27 (1945).
2. Stoner, E. C., "Magnetism and Matter", 532 (London, 1934).
3. Thompson, N., Proc. Phys. Soc., 52, 220 (1940). Jaffe, R. T., J. App. Phys., 19, No. 10, 867 (1948).
4. Nickel–cobalt. Cf. Honda, K., "Magnetic Properties of Matter".
5. Nickel–iron. Cf Marsh, J. S., "The Alloys of Iron and Nickel", 316 (New York, 1938)