@Misc{ 
  ambgan05,
  author = { Ambrosio, Luigi and Gangbo, Wilfrid },
  title = { Hamiltonian ODE's in the Wasserstein space of probability measures },
  journal = {  },
  year = { 2005 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1276/ },
  note = { cvgmt preprint}
}