@Article{ 
  MorPra12,
  author = { Mora-Corral, Carlos and Pratelli, Aldo },
  title = { Approximation of piecewise affine homeomorphisms by diffeomorphisms },
  journal = { J. Geom. Anal. },
  year = { 2012 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1910/ },
  note = { cvgmt preprint}
}