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              <p>A new approach is developed to treat the Mott localisation in strongly-correlated systems. It is based on a perturbation theory on the Hubbard model as a function of the superexchange coupling J. The Hartree term which is proved to correspond to the Gutzwiller approximation constitutes the natural ground state around which the system fluctuates. It is shown how superconductivity arises from intersite correlations developed by quantum fluctuations around a resonant state.</p>
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