@Misc{ 
  BraMosSqu15,
  author = { Brasco, Lorenzo and Mosconi, Sun-ra J. N. and Squassina, Marco },
  title = { Optimal decay of extremals for the fractional Sobolev inequality },
  journal = { Calc. Var. Partial Differential Equations },
  year = { 2015 },
  pages = { 30 },
  URL = { http://cvgmt.sns.it/paper/2758/ },
  note = { cvgmt preprint}
}