Parity Effect in a Small Superconducting Particle
  Matveev and Larkin calculated the parity effect on the ground state energy of a small superconducting particle in the regimes where the mean level spacing is either large or small compared to the bulk gap. We perform a numerical calculation which extends their results into the intermediate regime, where the level spacing is of the same order as the bulk gap. 
S. D. Berger and B. I. Halperin (Harvard University)