1. See, for example, Snoek, J. L., “New Developments in Ferromagnetic Materials” (Elsevier, 1947).
2. Went, J. J., Rathenau, G. W., Gorter, E. W., and van Oosterhout, G. W., Philips Tech. Rev., 14, 33 (1952).
3. Smiltens, J., and Fryklund, D. H., Progress Report V, Mass Inst. Tech., p. 58 (1949).
4. Galt, J. K., Matthias, B. T., and Remeika, J. P., Phys. Rev., 79, 39 (1950).
5. Galt, J. K., Yager, W. A., Remeika, J. P., and Merritt, F. R., Phys. Rev., 81, 470 (1951).