@Article{ 
  Ruf12,
  author = { Ruffini, Berardo },
  title = { Stability theorems for GNS inequalities: a reduction principle to the radial case },
  journal = { Rev. Mat. Complut. },
  year = { 2012 },
  pages = { 23 },
  URL = { http://cvgmt.sns.it/paper/1864/ },
  note = { cvgmt preprint}
}