  We adapt the Coupled Cluster Method to solid state strongly correlated
lattice Hamiltonians extending the Coupled Cluster linear response method to
the calculation of electronic spectra and obtaining the space-time Fourier
transforms of generic Green's functions. We apply our method to the $MnO_2$
plane with orbital and magnetic ordering, to interpret electron energy loss
experimental data, and to the Hubbard model, where we get insight into a
possible pairing mechanism.
