@Misc{ 
  san10,
  author = { Santambrogio, Filippo },
  title = { Gradient flows in Wasserstein spaces and applications to crowd movement },
  journal = {  },
  year = { 2010 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/511/ },
  note = { cvgmt preprint}
}