42 CHAPTER 4. THE MAGNETICALLY ORDERED STATEMorrish, A. H. (1965) The physical principles of magnetism. New York: John Wiley and Sons.
Nicklow, R. M., Koon, N. C., Williams, C. M., and Milstein, J. B. (1976) Phys. Rev. Lett., 36, 532.
Slater, J. C. (1930) Phys. Rev., 35, 509; Phys. Rev., 36, 57.
Sommerfeld, A. and Bethe, H. (1933) in H. Geiger and K. Scheel (Eds) Handbuch der physik, Berlin: Springer,
Vol. 24, Part 2, p. 595.
Verhoef, R., Quang, P. H., Franse, J. J. M., and Radwanski, R. J. (1988) J. Magn. Magn. Mater., 75, 319.
White, R. M. (1970) Quantum theory of magnetism, New York: McGraw-Hill.
