@Article{ 
  PegPiaSan13,
  author = { Pegon, Paul and Piazzoli, Davide and Santambrogio, Filippo },
  title = { Full characterization of optimal transport plans for concave costs },
  journal = { Discrete and Continuous Dynamical Systems },
  year = { 2015 },
  doi = { 10.3934/dcds.2015.35.6113 },
  volume = { 35 },
  number = { 12 },
  pages = { 6113-6132 },
  URL = { http://cvgmt.sns.it/paper/2280/ },
  note = { cvgmt preprint}
}