1. See for example: Callaway, J.: In: Physics of the transition metals. Rhodes, P. (ed.). Inst. Phys. Conf. Ser.55, 1 (1980)
2. For a collection of recent articles on this subject see: Selected papers in magnetism. Edwards, D.M. (ed.). J. Magn. Magn. Mater.45, No. 1 (1984)
3. See, for example: Wohlfarth, E.P.: Rev. Mod. Phys.25, 211 (1953)
4. Korenman, V., Murray, J., Prange, R.E.: Phys. Rev. B16, 4032 (1977)
5. Pindor, A.J., Staunton, J., Stocks, G.M., Winter, H.: J. Phys. F13, 979 (1983)