@Misc{ 
  arigazgru06a,
  author = { Arioli, Gianni and Gazzola, Filippo and Grunau, Hans-Christoph and Sassone, Edoardo },
  title = { The second bifurcation branch for radial solutions of the Brezis-Nirenberg problem in dimension four },
  journal = {  },
  year = { 2006 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/558/ },
  note = { cvgmt preprint}
}