@Misc{ 
  fig09d,
  author = { Figalli, Alessio },
  title = { Regularity properties of optimal maps between nonconvex domains in the plane },
  journal = { Comm. Partial Differential Equations },
  year = { 2009 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1063/ },
  note = { cvgmt preprint}
}