Superconducting Fluctuations in a Multi-Band 1D Hubbard Model
  A renormalization-group and bosonization approach for a multi-band Hubbard Hamiltonian in one dimension is described. Based on the limit of many bands, it is argued that this Hamiltonian with bare repulsive electron-electron interactions is scaled under specific conditions to a model in which superconducting fluctuations dominate. 
M.I. Salkola and A.V. Balatsky