@Misc{ 
  PetRiv13,
  author = { Petrache, Mircea and Rivière, Tristan },
  title = { Global gauges and global extensions in optimal spaces },
  journal = {  },
  year = { 2013 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2107/ },
  note = { cvgmt preprint}
}