1. Kahn, O. (1993) Molecular Magnetism, VCH Publishers, Inc., New York (USA).
2. Williams, J.M., Ferraro, J.R., Thorn, R.J., Carlson, K.D., Geiser, U., Wang, H.H., Kini, A.M. and Whangbo, M.H. (1992) Organic Superconductors. Synthesis, Structure, Properties and Theory, Prentice Hall, Englewood Cliffs, New Jersey (USA).
3. Mott, N. F. (1990) Metal-Insulator Transitions,Taylor and Francis, London;
4. Elliott, J. R. (1965) In Rado and Suhl (eds.), Magnetism,Academic Press, N Y., Vol IIA, p. 385;
5. For a detailed description of the exchange interactions in molecular materials, including the RKKY one, see also Coronado, E., Georges, R. and Tsukerblat, B. in Molecular Magnetism: From Molecular Assemblies to the Devices,NATO ASI Series, Coronado, E., Delhaes, P., Gatteschi, D. and Miller, J. S. (eds.), Kluwer Academic Publishers, (in press).