@Article{ 
  beipra10,
  author = { Beiglböck, Mathias and Pratelli, Aldo },
  title = { Duality for rectified Cost Functions },
  journal = { Calc. Var. PDE },
  year = { 2012 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/444/ },
  note = { cvgmt preprint}
}