Variations on Supersymmetry Breaking and Neutrino Spectra
  The problem of generating light neutrinos within supersymmetric models is discussed. It is shown that the hierarchy of scales induced by supersymmetry breaking can give rise to suppression factors of the correct order of magnitude to produce experimentally allowed neutrino spectra. 
F. Borzumati, K. Hamaguchi, Y. Nomura, and T. Yanagida