@Article{ 
  lis06,
  author = { Lisini, Stefano },
  title = { Characterization of absolutely continuous curves in Wasserstein spaces },
  journal = { Calc. Var. },
  year = { 2007 },
  volume = { 28 },
  pages = { 85-120 },
  URL = { http://cvgmt.sns.it/paper/568/ },
  note = { cvgmt preprint}
}