@Misc{ 
  PetVan15,
  author = { Petrache, Mircea and Van Schaftingen, Jean },
  title = { Controlled singular extension of critical trace Sobolev maps from spheres to compact manifolds },
  journal = {  },
  year = { 2015 },
  pages = { 26 },
  URL = { http://cvgmt.sns.it/paper/2784/ },
  note = { cvgmt preprint}
}