@Misc{ 
  cardepsan09,
  author = { Carlier, Guillaume and De Pascale, Luigi and Santambrogio, Filippo },
  title = { A strategy for non-strictly convex transport costs and the example of $||x-y||^p$ in ${\mathbb R}^2$ },
  journal = { Communications in Mathematical Sciences },
  year = { 2009 },
  pages = { 9 },
  URL = { http://cvgmt.sns.it/paper/1056/ },
  note = { cvgmt preprint}
}