@Article{ 
  dansav08,
  author = { Daneri, Sara and Savaré, Giuseppe },
  title = { Eulerian calculus for the displacement convexity in the Wasserstein distance },
  journal = { SIAM J. Math. Anal. },
  year = { 2008 },
  volume = { 40 },
  pages = { 1104-1122 },
  URL = { http://cvgmt.sns.it/paper/1585/ },
  note = { cvgmt preprint}
}