1. Valence fluctuation phenomena
2. See the Proceedings of the Koln Conference on Valence Fluctuations (1984) to be published in Jour. Mag. and Mag. Mat.
3. M. Croft, F. Lu, M. E. Melczer, A. Zolandz, G. Hall and E. G. Spencer, ibid 2.
4. See for example numerous references in IEEE Trans. Magn., Vol. Mag-18, No. 6.