@Article{ 
  danpra11,
  author = { Daneri, Sara and Pratelli, Aldo },
  title = { Smooth approximation of bi-Lipschitz orientation-preserving homeomorphisms },
  journal = { Ann. Inst. H. Poincar\'e Anal. Non Lin\'eaire },
  year = { 2014 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1616/ },
  note = { cvgmt preprint}
}