1. See the Proceedings of the Fourth International Conference on Valence Fluctuations, J. Magn. Magn. Mater.47 and48 (1985)
2. M�ller-Hartmann, E.: Springer Series in Solid-State Sciences. Vol. 29: Electron Correlation and Magnetism in Narrow-Band Systems. Moriya, T. (ed.). Berlin, Heidelberg, New York: Springer 1981
3. Kuramoto, Y., M�ller-Hartmann, E.: In: Valence fluctuations in solids. Falicov, L.M., Hanke, W., Maple, M.B. (eds.). Amsterdam: North-Holland 1981
4. M�ller-Hartmann, E.: In: Moment formation in solids. Buyers, W.J.L. (ed.). New York, London: Plenum Press 1984
5. Schmidt, H.J., M�ller-Hartmann, E.: Z. Phys. B ? Condensed Matter60, 363 (1985)