1. P. Fulde:Electron Correlations in Molecules and Solids (Springer, Heidelberg, 1991).
2. A. L. Kuzemsky:Correlation effects in high T c superconductors and heavy fermion compounds, inProceedings of the International Conference on Superconductivity and Strongly Correlated Electron Systems, Amalfi, October 1993, edited byC. Noce et al. (World Scientific, Singapore, 1994).
3. A. L. Kuzemsky:Dokl. Acad. Nauk SSSR,309, 323 (1989).
4. A. L. Kuzemsky: inProceedings of the V International Symposium on Selected Topics in Statistical Mechanics (World Scientific, Singapore, 1990), p. 157.
5. P. W. Anderson:Phys. Rev.,124, 41 (1961).